Some of the dominant traits studied by Mendel were

Which of the following characters was not chosen by Mendel?

____________ code for a pair of contrasting traits of same gene.

A recessive allele is expressed in

The characters which appear in the first filial generation are called

In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F₁ generation will be

On crossing two heterozygous tall plants (Tt), a total of 500 plants were obtained in F₁ generation. What will be the respective number of tall and dwarf plants obtained in F₁ generation?

In mice, black coat colour (allele B) is dominant to brown coat colour (allele b). The offspring of a cross between a black mouse (BB) and a brown mouse (bb) were allowed to interbreed. What percentage of the progeny would have black coats?

In fruit flies, long wing is dominant to vestigial wing. When heterozygous long – winged flies were crossed with vestigial- winged flies, 192 offsprings were produced. If an exact Mendelian ratio had been obtained, then the number of each phenotype would have been

What is the probability of production of dwarf offsprings in a cross between two heterozygous tall pea plants?

A tobacco plant heterozygous for a recessive character is self-pollinated and 1200 seeds are subsequently germinated. How many seedlings would have the parental genotype?

To determine the genotype of tall plant of F₂ generation, Mendel crossed this plant with a dwarf plant. This cross represents a

Read the given statements and select the correct option.

Statement 1: Test cross is used to determine an unknown genotype within one breeding generation.

Statement 2: Test cross is a cross between F₁ hybrid and dominant parent.

Read the given Statements and select the correct option.

Statement 1: The law of segregation is one of the most important contributions to the biology

Statement 2: Law of segregation introduced the concept of heredity factors as discrete physical entities which do not become blended.

The inheritance of flower colour in Antirrhinum (dog flower) is an example of

Phenotypic and genotypic ratio is similar in case of

In four o’ clock plants, the gene for red flower colour (R) is in incompletely dominant over the gene for white flower colour (r), hence the plants heterozygous for flower colour (Rr) have pink flowers. What will be the ratio of offsprings in a cross between red flowers and pink flowers?

Andalusian fowls have two pure forms -black and white. If black forms (BB) and white forms (WW) are crossed, F₁ individuals appear blue coloured (BW), due to incomplete dominance. Which of the following would be an outcome of a cross between black form and blue form?

ABO blood groups in human beings are controlled by the gene |. The gene | has three alleles - |^A, |^B and i. Since there are three different alleles, six different genotypes are possible.

How many phenotypes can occur?

What can be the blood group of offspring when both parents have AB blood group?

A cow with red coat is crossed with a bull having white coat. Their offspring produced in F₁ generation showed roan coat. This effect is produced due to juxtaposition of small patches of red and white colour. What can be assumed about the gene controlling coat colour in cattle?

ABO blood grouping in human beings cites the example of

In mice, Y is the dominant allele for yellow fur and y is the recessive allele for grey fur. Since Y is lethal when homozygous, the result of cross Yy x Yy will be

In mendelian dihybride cross, when heterozygous round yellow are self-crossed, round green offspring are represented by the genotype.

Match column I with column II and select the correct option from the given codes.

Column I Column II

A Dihybrid test cross (i) 9:3:3:1

B Law of segregation (ii) Dihybrid cross

C Law of independent (iii) 1:1:1:1

assortment

D ABO blood group (iv) Purity of gametes

in man

(v) Multiple allelism

When a cross is made between a tall plant with yellow seed (Tt Yy) and a tall plant with green seeds (Tt yy), what is true regarding the proportions of phenotypes of the offsprings in F₁ generation?

How many types of gametes can be produced by a diploid organism who is heterozygous for loci?

In certain plant, yellow fruit colour (Y) is dominant to green fruit colour (y) and round shape (R) is dominant to oval shape (r). The two genes involved are located on different chromosomes.

Which of the following will result when plant YyRr is self-pollinated?

In certain plant, yellow fruit colour (Y) is dominant to green fruit colour (y) and round shape (R) is dominant to oval shape (r). The two genes involved are located on different chromosomes.

Which of the following is correct for the condition when plant YyRr is back crossed with the double recessive parent?

“When two pairs of traits are combined in a hybride, segregation of one pair of characters is independent of the other pair of characters”. The statement explains which of the following laws/principles of mendel?

Law of independent assortment can be explained with the help of

Which three scientists independently rediscovered mendel’s work?

Chromosomal theory of inheritance was given by

Experimental verification of ‘chromosomal theory of inheritance’ was done by

Match column I with column II and select the correct option from the given codes.

Column I Column II

A. Multiple allelism (i) Tt x tt

B. Back cross (ii) Tt x TT

C. Test cross (iii) Human blood groups

D. Crossing over (iv) Non – parental gene

combination

E. Recombination (v) Non – sister

chromatids

Genes located very close to one another on same chromosome tend to be transmitted together and are called

Males of silkworm Bombyx mori are known to produce more silk per unit quantity of leaf consumed. Hence, they are preferably bred in sericulture industry. Which of the following genotypes should be crossed in order to get maximum fraction of healthy male insects?

The cross over percentage between linked genes J and M is 20%, J and L is 35%, J and N is 70%, L and K is 15%, M and N is 50%, and M and L is 15%. Thus, the sequences of genes on the chromosomes is

A woman who is a carrier of a certain disease marries a man who is normal for this trait. They have five children (2 daughters and 3 sons). All sons suffer from the given disease but none of the daughters were affected as the disease show diagynic pattern. Which of the following could be this disease?

Consider the following statements regarding chromosomal aberrations and select the incorrect ones.

I. Chromosomal aberrations refer to changes in number and arrangement of genes in the chromosomes.

II. Aneuploidy refers to the condition where the genome comprises of extra or fewer chromosomes than its normal number in a species.

III. Heteroploidy occurs due to non-disjunction of chromosomes of homologous pair.

IV. Nullisomy is a type of hyperploidy in which one chromosome is devoid of its homologue.

The allele for pea comb (P) in chickens is completely dominant to the allele for single comb (p). The alleles for black feather colour (B), and white feather colour (B’) show incomplete dominance, so that BB’ individuals possess grey feathers. If chickens heterozygous for both pairs of genes are matched, what proportion of offspring are expected to be single combed and grey feathered?

Study the two cases carefully. What would be the correct interpretation of the two cases?

Case Mother Father Children

Case I With Normal son always with

disease diseases

Case II With Normal Sons and daughters

disease could show disease

A pedigree is shown below for a disease that is autosomal dominant. What would be the genetic make up of the first generation?

In humans, attached earlobes are a dominant feature over free earlobes while hypertrichosis of the ear is a holandric (Y-linked) feature. A man with attached earlobes and extensive hair on pinna married a woman having free earlobes. The couple had one son with attached earlobes and hairy pinna, another son with free earlobes and hairy pinna and two daughters with attached earlobes. One of the daughters married a man with free earlobes and sparse hair on pinna. They had two sons. What would be the characteristics of their pinnae?

Mother and father of a person with ‘O’ blood group have ‘A’ and ‘B’ blood group respectively. What would be the genotype of both mother and father?

In the F₂ generation of a mendelian dihybrid cross the number of phenotypes and genotypes are

It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the

The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to

Occasionally, a single gene may express more than one effect. The phenomenon is called

In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that

ZZ/ZW type of sex determination is seen in

Person having genotype /^A /^B would show the blood group as AB. This is because of

In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplet codes for valine?

Distance between the genes and percentage of recombination shows

Conditions of a karyotype 2n± 1 and 2n ± 2 are called

Which of the following trait is controlled by sex linked recessive genes?

. In this disease, there occurs a failure of chloride ion transport mechanism in cell surface membrane of epithelial cells; sweat of the patient conditions very high level of Na⁺ and Cl^- ions. This disease is

Select the disease which is caused by recessive autosomal genes when present in homozygous condition

. If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

Which of the following is not an example of recessive autosomal disease?

An individual affected by phenylketonuria lacks an enzyme that converts the amino acid _________ into __________.

Red green colourblindness is a sex linked trait. Which of the given statements is not correct regarding colourblindness?

The disease sickle-cell anaemia is caused by the substitution of (i) by (ii) at the (iii) position of (iv) globin chain of haemoglobin molecule.

Which of the following correctly fills the blanks in the above statement?

A marriage between a colourblind man and a normal woman produces.

A colourblind man (X^cY) marries a woman who is carrier for haemophilia (XX^h). Which of the following is true for their progenies?

If a haemophilic man marries a carrier woman then which of the following holds true for their progenies?

____________ is an example of X-linked recessive trait.

In heritance of which of the following traits is shown in the given cross?

Refer to the given family tree and answer the question.

What are the chances of this couple’s fifth child being an albino?

Refer to the given family tree and answer the question.

If A=normal allele, a=albino allele, then genotypes of father and mother are respectively.

Study the pedigree chart of a family showing the inheritance of myotonic dystrophy.

The trait under study is

Study the pedigree chart of a family showing the inheritance of sickle-cell anaemia

The traits traced in the above pedigree chart is

Given pedigree chart depicts the inheritance of attached ear lobes, an autosomal recessive trait.

Which of the following conclusions drawn is correct?

In humans, polydactyly (i.e, presence of extra fingers and toes is determined by a dominant autosomal allele (P) and the normal condition is determined by a recessive allele (p). Find out the possible genotypes of family members 1, 2 and 3 in the given pedigree.

In maize, coloured endosperm (c) is dominant over colourless (c); and full endosperm (R) is dominant over shrunken (r). When a dihybrid of F₁ generation was test crossed, it produced four phenotypes in the following percentage:

Coloured full – 48% Coloured shrunken – 5%

Colourless full – 7% Colourless shrunken – 40%

From this data, what will be the distance between two non- allelic genes?

Refer to the given figure of cross A and cross B and select the correct statement regarding them.

What is true about the crossing over between linked genes?

Chromosome maps/genetic maps were first prepared by

Given diagram shows a pair of homologous chromosomes during meiosis.

Maximum crossing over will occur between genes

Which of the following are reasons for Mendel’s success?

(i) Usage of pure lines or pure breeding varieties

(ii) Consideration of one character at a time

(iii) Maintenance of statistical records of experiments

(iv) Knowledge of linkage and incomplete dominance

If linkage was known at the time of mendel then which of the following laws, he would not have been able to explain?

Read the given statement and select the correct option.

(i) Percentage of homozygous dominant individuals obtained by selfing Aa individuals is 25%.

(ii) Types of genetically different gametes produced by genotype AABbcc are 2.

(iii) Phenotypic ratio of monohybrid F₂ progency in case of Mirabilis jalapa is 3:1.

In polygenic inheritance

In a cross between negro and albino skin colour of humans showing polygenic inheritance, the phenotypic ratio in F₂ generation will be

When a single gene influences more than one trait it is called

XO type of sex determination and XY type of sex determination are the examples of

Select the correct statements regarding honeybees.

(i) The queen bee and the worker bees develop from fertilized eggs and are sexually females.

(ii) Males (drones develop parthenogenetically from unfertilized eggs.

(iii) Queen bee feeds upon royal jelly and the worker bees feed upon bee bread.

Number of autosomes present in liver cells of a human female is

In honeybees, females are (i) having (ii) chromosomes and males are (iii) having (iv) chromosomes.

Refer to the given figure.

This type of sex determination is found in

Find out the mismatched pair.

Refer to the given figure representing karyotype of individual who inflicted with this chromosomal disorder.

Select the correct statement regarding it.

Due to nondisjunction of chromosomes during spermatogenesis, some sperms carry both sex chromosomes (22A + XY) and some sperms do not carry any sex chromosome (22A + O). If these sperms fertilise normal eggs (22A + X), what types of genetic disorders appear accordingly among the offsprings?

Rate of mutation is affected by

Insertion or deletion of a single base causes

Point mutation may occur due to

Select the incorrect statement regarding pedigree analysis.

The possibility of a female becoming hameophilic is extremely rare because mother of such a female has to be at least (i) and father should be (ii).

Read the given statements.

(i) Incomplete or mosaic inheritance is an example of pre-Mendelian concept of blending inheritance.

(ii) Test cross is a special type of back cross.

(iii) Chromosomal aberrations are commonly observed in cancer cells.

(iv) Thalassemia is a Mendelian disorder.

Which of the above statements are correct?