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WorksheetsHeredity
Total questions: 40
Worksheet time: 23mins
______ are different forms of the same gene that are always found on the same position of two homologous chromosomes.
chromatids
loci
nucleotides
The karyotype, or chromosomal profile, for humans is shown. Which of the following is true of this individual?
The individual suffers from Klinefelter syndrome, a genetic condition that results when a boy is born with an extra copy of the X chromosome.
The individual suffers from Trisomy 21, a chromosomal disorder that results in three copies of chromosome 21.
The individual suffers from Cri du chat syndrome, a rare genetic disorder caused by missing pieces on a particular chromosome.
The individual appears to have no chromosomal mutations.
In pea plants, being tall (T) is dominant over being short (t). What law BEST explains why a pea plant with Tt will show only the dominant phenotype?
Law of Dominance
Law of Segregation
Law of Independent Assortment
Law of Filial Generations
A tall pea plant (Tt) is crossed with a short pea plant (tt). What percentage of their offspring would be short?
0%
25%
50%
100%
In horses, black (B) is the dominant color; brown (b) is the recessive color. Consider the cross seen here, between two black horses (Bb). What is the probability that these two horses will have a foal that is brown?
0%
25%
40%
50%
In horses, black (B) is the dominant color; brown (b) is the recessive color. Consider the cross seen here, between two black horses (Bb). What is the genotype of the brown foal from the Punnett square above?
BB
Bb
bb
bB
In horses, black (B) is the dominant color; brown (b) is the recessive color. Consider the cross seen here, between two black horses (Bb). What is the phenotype of the parent horses (Bb) from the Punnett square above?
black
brown
BB
Bb
Human height occurs in a continuous range because it is affected by the interaction of many genes, making it a(n) _______.
example of codominance
autosomal trait
sex-linked trait
polygenic trait
A species of butterfly is codominant for wing color. If a blue butterfly (B) mates with a yellow butterfly (Y), what would their offspring look like?
green
blue and yellow
blue
yellow
Use the Punnett square above. Which phrase describes the parents’ genotypes for this trait?
both heterozygous
one homozygous recessive and one heterozygous
one homozygous dominant and one heterozygous
one homozygous dominant and one homozygous recessive
What percentage of offspring from this cross would have round seeds?
0%
25%
50%
75%
what is the phenotypic ratio of the cross shown?
1 round : 3 wrinkled
2 round : 2 wrinkled
3 round : 1 wrinkled
4 round : 0 wrinkled
Use the pedigree to answer this question: What is represented by a white square?
a female with the trait
a male with the trait
a female without the trait
a male without the trait
How many grandchildren do the original couple (I-1 and I-2) have?
6
3
5
0
This pedigree is tracking cystic fibrosis, which is a recessive genetic disease. Based on this information, what would be the genotype of the grandmother (I-2)?
FF
Ff
ff
cannot be determined
Suppose individual III-4 produces offspring with a heterozygous carrier of the trait. Which of the following would be the phenotypic ratio of the offspring?
1:1 (carrier: cystic fibrosis)
1:2:1 (normal: carrier: cystic fibrosis)
1:0 (cystic fibrosis)
3:1 (cystic fibrosis: normal)
Which Mendelian law of inheritance states that organisms inherit two copies of each gene and donate one copy to each of their offspring?
the law of independent assortment
the law of dominance
the law of segregation
the law of incomplete dominance
Humans can have type A blood, type B blood, type AB blood, or type O. Which of the following is a possible genotype for an individual with type B blood?
I^B I^B
I^A I^B
ii
I^A I^A
Which pair of genes in the diagram would most likely be inherited together as an example of gene linkage?
genes A and E
genes B and D
genes E and C
genes A and B
A genetic cross involving two unlinked genes is represented. AaGg x AaGg. Which of the following shows the correct phenotypic ratio for this cross?
1:1:1:1
3:1:3:1
9:3:3:1
1:3:1:3
Some angelfish colors are determined by codominance. Possible phenotypes and genotypes of angelfish colors are
silver- bb, black- BB, and black lace- Bb.
Which table shows the expected phenotypes of offspring resulting from a cross between a black angelfish and a black lace angelfish?
A
B
C
D
If an organism inherits one dominant allele and one recessive allele for eye color (Bb), their genotype would be:
haploid
homozygous
heterozygous
homologous
Which of the following is a homozygous recessive genotype?
AA
Aa
aA
aa
A father has type A blood (IA i) and the mother has type AB blood (IA IB). Which blood type would be impossible for their children to have?
A
B
O
AB
The following pedigree represents an inheritance pattern for an autosomal dominant trait. Based on this pedigree, what are the most likely genotypes of individuals I-1 and I-2?
I-1: Aa; I-2: Aa
I-1: Aa; I-2: aa
I-1: aa; I-2: aa
I-1: aa; I-2: AA
Which statement describes asexual reproduction but not sexual reproduction?
New organisms are formed only after fertilization.
Daughter cells contain the same genetic information as parent cells.
A single cell will not develop into a full organism.
Daughter cells contain half the genetic material of the parent cell.
Farmer Dan grows corn for a living. One day, Farmer Hal suggests to Farmer Dan that he should clone his best corn plant in order to produce more ears of corn per plant. Farmer Dan is not sure about Farmer Hal’s idea. Why might Farmer Dan be hesitant to clone his corn?
Cloning the corn plants is difficult and expensive to accomplish.
The cloned corn would not have the same taste as the original plants.
Cloning eliminates the ability to sexually reproduce and provide genetic variability.
Cloned plants would have increased genetic variability as well as a shortened life expectancy.
In rabbits, white fur is a recessive trait. Based on this fact, what statement BEST describes this rabbit's genotype if it has white fur?
It must have the genotype Bb.
It is homozygous for fur color.
It cannot have the genotype bb.
It is heterozygous for fur color.
The image shows asexual reproduction in hydra. According to the illustration, all offspring are ________.
genetically different from the parent
genetically identical to the parent
slightly similar to the parent
genetically varied
Which of the following is NOT an example of a mutagen that could cause a genetic mutation in an organism?
UV radiation
infectious agents
chemicals
RNA
A red flower and a white flower can be expressed on a plant, depending on genetics. Which outcome would indicate incomplete dominance as the inheritance pattern for flower color in this species?
a white flower
a red flower
a pink flower
a pink and white striped flower
Different forms of a gene
allele
genotype
phenotype
The physical look of a trait
genotype
phenotype
allele
Mendelian inheritance
a simple genetic rule where a gene only comes in dominant or recessive forms
Genotype
Allele
Mendelian Inheritance
Phenotype
When you have two different alleles
recessive
dominant
homozygous
heterozygous
When you have two of the same alleles
dominant
homozygous
recessive
heterozygous
