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WorksheetsEcology
Total questions: 37
Worksheet time: 37mins
In sickle cell anaemia, glutamic acid is replaced by valine. Which one of the following triplets codes for valine
GAA
GAG
GUA
GUG
Persons having genotype IAIB would show the blood group AB. This is because of
Pleiotropy
Co-dominanace
Segregation
Incomplete dominanace
All genes located on the same chromosome
forms different groups depending upon their relative distance
form one linkage group
will not form any linkage groups
forms interactive group that affect the phenotype
If a haemophilic woman marries a normal man
all their children will be normal
all their sons will be haemophilic
all their daughters will be haemophilic
50% sons and 50% daughters will be haemophilic
A woman with normal vision has a colourblind father. she marries a colourblind man. What proportion of their children will be colourblind?
25%
0%
50%
100%
Ocassionally a single gene may express more than one effect. This phenomenon is called
multiple allelism
mosaicism
pleiotropy
polygeny
it is used to stop the cell division at metaphase of karyotyping.
Renin
colchicine
sebum
melatonin
Which is an autosomal dominant disorder
Thalassemia
Phenylketonuria
Albinism
Huntington's chorea
Red flower (RR) flower of Antirrhinum is crossed with white flower (rr). If the offspring obtained in F1 generation is pink flower, what type of inheritance will it be called?
a. Co-Dominance
b. Dominant Recessive
c. Epistasis
d. Incomplete Dominance
If two genes lie very close to each other, it will show
a. high degree of crossing over
b. double crossing over
c. low linkage
d. nil or low crossing over
Given below are statements to differentiate between genotype and phenotype. On of the statements is incorrect. Find it.
a. Genotype is the gene equipment which determines the trait whereas phenotype is expression of the trait
b. Phenotype can be observed directly while genotypes cannot be observed but ascertained
c. genotype changes under environmental influence, phenotype do not
d. Phenotype is determined by genotype while genotype is not determined by phenotype
In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation pink flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red and pink flowers. Choose the incorrect statement from the following :
This experiment does not follow the Principle of Dominance.
Pink colour in F1 is due to incomplete dominance.
Ratio of F2 is 1/4 (Red) : 2/4 (Pink) : 1/4 (White)
Law of Segregation does not apply in this experiment
(A)-(iv), (B)-(ii), (C)-(i), (D)-(iii)
(A)-(ii), (B)-(iv), (C)-(i), (D)-(iii)
(A)-(i), (B)-(iv), (C)-(ii), (D)-(iii)
(A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)
(A) - i, (B) - ii, (C) - iii, (D) – iv
(A) - ii, (B) - iii, (C) - iv, (D) - i
(A) - iii, (B) - i, (C) - iv, (D) – ii
(A) - i, (B) - iii, (C) - iv, (D)- ii
F1 individual of the cross AAbb x aaBB was test crossed. If both non-allelic genes are 24 map units apart then calculate the percentage of aaBb :
24%
12%
76%
38%
The linkage map of X-chromosome of fruitfly has 66 units, with yellow body gene (Y) at one end and bobbed hair (b) gene at the other end. The recombination frequency of these two genes (Y and b) should be :
66%
> 50%
< 50%
100%
A man marries a woman and both do not show any apparent traits of inherited disease. Five sons and two daughters are born, and three of their sons suffer from a disease. However, none of the daughters is affected. The following mode of inheritance for the disease is
Sex-linked recessive
Sex-linked dominant
Autosomal dominant
None of the above
A true breeding pea plant variety is the one that shows _____________________
Varying traits every generation after undergoing continuous cross pollination.
stable trait inheritance every generation after undergoing continuous self pollination.
Individuals that are shaded in have premature hair whitening. Is this trait dominant or recessive? How do you know?
Dominant because it skips generations
Dominant because it is present in every generation
Recessive because it skips generations
Recessive because it is present in every generation.
In a cross between negro and albino skin colour of humans showing polygenic inheritance, the phenotypic ratio in F2 generation will be
9:3:3:1
1:6:15:20:15:6:1
1:4:6:4:1
1:2:2:4:1:2:1:2:1
Refer to the given figure, this type of sex determination is found in
grasshoppers and cockroaches
birds and reptiles
butterflies and moths
honeybees, ants and wasps
IN THE TEST CROSS
UNKNOWN HYBRID IS CROSSED WITH HOMOZYGOUS DOMINANT PARENT
UNKNOWN HYBRID IS CROSSED WITH HETEROZYGOUS PARENT
UNKNOWN HYBRID IS CROSSED WITH HOMOZYGOUS RECESSIVE PARENT
NONE OF THE ABOVE
T H MORGAN EXPERIMENTALLY VERIFIED CHROMOSOMAL THEORY OF INHERITANCE BY USING Drosophila melanogaster BECAUSE
IT COMPLETES ITS LIFE CYCLE IN ABOUT TWO WEEKS
IT PRODUCES LARGE NUMBER OF PROGENIES IN SINGLE MATING
MALE IS DISTINCT FROM FEMALE
ALL OF THE ABOVE
Turner syndrome is
47+XXY
45+XO
46+XY
47+XX
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
The ratio 9 : 7 is produced due to –
complementary genes
supplementary genes
lethal genes
epistatic genes
Which of the following genes have similar genotypic effect when present separately but produce different trait after interacting together and give a ratio of 9 : 7 in F2 generation?
Complementary genes
Jumping genes
Duplicate genes
House-keeping genes
3. Which of the following characteristics represent ‘Inheritance of blood groups’ in humans?
I. Dominance
II. Co-dominance
III. Multiple allele
IV. Incomplete dominance
V. Polygenic inheritance
II, IV and V
I, II and III
II, III and V
I, III and V
Cytoplasmic male sterility in maize is due to defective
Mitochondria
Lysosome
Golgi body
Leucoplast
Find the incorrect match
Gamete : Pure for a trait
Co-dominance : Flower colour in Snapdragon
recessive gene : Expressed in homozygous
Incomplete dominance : Carl correns
50% sperms are devoid of sex-chromosomes in
Melandrium
Moth
Grasshopper
Bee
The pie chart shows the results of a survey of the incidence of blood groups A, B, AB & O amongst people in India.
Which of the following conclusions can be deduced from the diagram ?
Only 5% of individuals are heterozygous for blood group alleles.
Group O is the most common as it is the homozygous recessive group.
The alleles for blood group A and B are dominant to the allele for blood group O.
Any individual, selected at random from the sample population, has a 1 in 20
wo linked genes a and b show 20% recombination. The individuals of a hybrid cross between ++/++ x ab/ab shall show gametes:
++ 5.0 : ab 50
++ 80 : ab 20
++ 40 : ab 40 : + a 10 : + b 10
++30 : ab 30 : + a 20 : + b 20
