Biol 4003 questions with correct
answers rated A+ passed
. Which of the following statements is true?
A homozygote has different alleles for a given gene.
A pea plant with the genotype TT is heterozygous.
An allele is a form of a gene.
A true-breeding individual is heterozygous. - ANS ✔✔An allele is a form of a gene.
True-breeding plants with yellow/round seeds were crossed to true-breeding plants with
green/wrinkled seeds. All of the F1 plants produced yellow/round seeds. The genes that affect
these traits independently assort. If the F1 plants were crossed to plants that produce
green/wrinkled seeds, the ratio of seed phenotypes of the F2 generation would be
3 yellow/round seeds : 1 green/wrinkled seeds
9 yellow/wrinkled seeds : 3 yellow/round seeds : 3 green/wrinkled seeds : 1 green/round seeds
9 yellow/round seeds: 3 yellow/wrinkled seeds : 3 green/round seeds : 1 green/wrinkled seeds
,1 yellow/wrinkled seeds : 1 yellow/round seeds : 1 green/wrinkled seeds : 1 green/round seeds
- ANS ✔✔1 yellow/wrinkled seeds : 1 yellow/round seeds : 1 green/wrinkled seeds : 1
green/round seeds
In pea plants, tall is dominant to dwarf. If two heterozygous tall plants are crossed, what is the
expected phenotypic ratio of the offspring?
3 tall : 1 dwarf
1 tall : 1 dwarf
1 tall : 3 dwarf
All tall - ANS ✔✔3 tall : 1 dwarf
A plant is heterozygous for five genes: AaBbCcDdEe. If the plant self-fertilizes, what is the
probability that an offspring will be AaBbCcDdEe?
243/1024 = 0.24
1/32 = 0.031
1/1024 = 0.00098
1/4 = 0.75 - ANS ✔✔1/32 = 0.031
, A female who is IB i has offspring with a male who IA IA. Which blood type(s) would be possible
for their offspring?
Type A only
Type A and type AB
Type A and type B
Type A and type O - ANS ✔✔Type A and type AB
Hemophilia A is an X-linked recessive trait in which the blood does not clot properly. An
unaffected mother and a father with hemophilia have a daughter with hemophilia. Their next
offspring is a son named Dan. What is the likelihood that Dan has hemophilia?
0%
25%
50%
100% - ANS ✔✔50%
Two different strains of plant exhibit a recessive phenotype of white flowers. When crossed,
they produce offspring with wild-type purple flowers. This phenomenon of obtaining purple
flowers is called __________ and it indicates that _________________________________.
epistasis/the recessive alleles mask the dominant alleles.
answers rated A+ passed
. Which of the following statements is true?
A homozygote has different alleles for a given gene.
A pea plant with the genotype TT is heterozygous.
An allele is a form of a gene.
A true-breeding individual is heterozygous. - ANS ✔✔An allele is a form of a gene.
True-breeding plants with yellow/round seeds were crossed to true-breeding plants with
green/wrinkled seeds. All of the F1 plants produced yellow/round seeds. The genes that affect
these traits independently assort. If the F1 plants were crossed to plants that produce
green/wrinkled seeds, the ratio of seed phenotypes of the F2 generation would be
3 yellow/round seeds : 1 green/wrinkled seeds
9 yellow/wrinkled seeds : 3 yellow/round seeds : 3 green/wrinkled seeds : 1 green/round seeds
9 yellow/round seeds: 3 yellow/wrinkled seeds : 3 green/round seeds : 1 green/wrinkled seeds
,1 yellow/wrinkled seeds : 1 yellow/round seeds : 1 green/wrinkled seeds : 1 green/round seeds
- ANS ✔✔1 yellow/wrinkled seeds : 1 yellow/round seeds : 1 green/wrinkled seeds : 1
green/round seeds
In pea plants, tall is dominant to dwarf. If two heterozygous tall plants are crossed, what is the
expected phenotypic ratio of the offspring?
3 tall : 1 dwarf
1 tall : 1 dwarf
1 tall : 3 dwarf
All tall - ANS ✔✔3 tall : 1 dwarf
A plant is heterozygous for five genes: AaBbCcDdEe. If the plant self-fertilizes, what is the
probability that an offspring will be AaBbCcDdEe?
243/1024 = 0.24
1/32 = 0.031
1/1024 = 0.00098
1/4 = 0.75 - ANS ✔✔1/32 = 0.031
, A female who is IB i has offspring with a male who IA IA. Which blood type(s) would be possible
for their offspring?
Type A only
Type A and type AB
Type A and type B
Type A and type O - ANS ✔✔Type A and type AB
Hemophilia A is an X-linked recessive trait in which the blood does not clot properly. An
unaffected mother and a father with hemophilia have a daughter with hemophilia. Their next
offspring is a son named Dan. What is the likelihood that Dan has hemophilia?
0%
25%
50%
100% - ANS ✔✔50%
Two different strains of plant exhibit a recessive phenotype of white flowers. When crossed,
they produce offspring with wild-type purple flowers. This phenomenon of obtaining purple
flowers is called __________ and it indicates that _________________________________.
epistasis/the recessive alleles mask the dominant alleles.
