BIOL 4003 Exam 1 questions well
answered
Let's suppose that true-breeding pea plants with purple flowers and yellow seeds were crossed
to true-breeding plants with white flowers and green seeds. The F1 plants had purple flowers
that produced yellow seeds. The genes that affect these traits independently assort. If the F1
plants were allowed to self-fertilize, the expected ratio of the F2 generation would be - correct
answer ✔✔ 9 purple flowers/yellow seeds: 3 white flowers/yellow seeds : 3 purple
flowers/green seeds : 1 white flowers/green seeds
Which of the following statements is false?
An allele is a gene.
A true-breeding individual is homozygous.
A heterozygote has different alleles for a given gene.
Correct! For most species, a chromosome carries a single gene.
A. An allele is a gene.
B. A true-breeding individual is homozygous.
C. A heterozygote has different alleles for a given gene.
D. For most species, a chromosome carries a single gene. - correct answer ✔✔ For most species,
a chromosome carries a single gene.
In humans, let's suppose an individual has a diploid set of autosomes and is XXY with regard to
their sex chromosomes. This person would be ____________ because ___________. - correct
answer ✔✔ male, they have a Y chromosome.
, The pedigree below involves a genetic disease in humans. Affected individuals are shown in
black.
Which of the following patterns is/are consistent with this pedigree? - correct answer ✔✔
Autosomal recessive only
If a rare dominant allele exerts its effect by antagonizing (inhibiting) the function of the wild-
type (normal) protein, this phenomenon is called - correct answer ✔✔ a dominant negative
mutation.
A trait exhibits incomplete dominance. If one of the two alleles is a loss-of-function allele, a
reasonable molecular explanation would be - correct answer ✔✔ 50% of the functional protein
is not enough to give the same phenotype as 100%.
Hemophilia, type A, is an X-linked recessive trait. A mother with hemophilia and a father
without hemophilia have a son named Rodrigo. If we tested Rodrigo's blood, the likelihood that
he has hemophilia, type A is - correct answer ✔✔ 100%
In certain breeds of cattle, having scurs is a sex-influenced trait. Having scurs is dominant in
males and not having scurs is dominant in females. If a bull (male) without scurs is crossed to a
cow (female) with scurs, what are the possible phenotypes of the offspring? - correct answer
✔✔ males with scurs and females without scurs
A strain producing white flowers (ccPP) is crossed to a different strain (CCpp) that also produces
white flowers. The F1 offspring have purple flowers. If a CCpp plant is crossed to a ccPp plant,
what is the expected ratio of phenotypes in the offspring? - correct answer ✔✔ 1 purple: 1
white
Which of the following is not likely to be a category for one of the topics in your long-term
project, which will use gene editing? - correct answer ✔✔ Cloning a mammal
answered
Let's suppose that true-breeding pea plants with purple flowers and yellow seeds were crossed
to true-breeding plants with white flowers and green seeds. The F1 plants had purple flowers
that produced yellow seeds. The genes that affect these traits independently assort. If the F1
plants were allowed to self-fertilize, the expected ratio of the F2 generation would be - correct
answer ✔✔ 9 purple flowers/yellow seeds: 3 white flowers/yellow seeds : 3 purple
flowers/green seeds : 1 white flowers/green seeds
Which of the following statements is false?
An allele is a gene.
A true-breeding individual is homozygous.
A heterozygote has different alleles for a given gene.
Correct! For most species, a chromosome carries a single gene.
A. An allele is a gene.
B. A true-breeding individual is homozygous.
C. A heterozygote has different alleles for a given gene.
D. For most species, a chromosome carries a single gene. - correct answer ✔✔ For most species,
a chromosome carries a single gene.
In humans, let's suppose an individual has a diploid set of autosomes and is XXY with regard to
their sex chromosomes. This person would be ____________ because ___________. - correct
answer ✔✔ male, they have a Y chromosome.
, The pedigree below involves a genetic disease in humans. Affected individuals are shown in
black.
Which of the following patterns is/are consistent with this pedigree? - correct answer ✔✔
Autosomal recessive only
If a rare dominant allele exerts its effect by antagonizing (inhibiting) the function of the wild-
type (normal) protein, this phenomenon is called - correct answer ✔✔ a dominant negative
mutation.
A trait exhibits incomplete dominance. If one of the two alleles is a loss-of-function allele, a
reasonable molecular explanation would be - correct answer ✔✔ 50% of the functional protein
is not enough to give the same phenotype as 100%.
Hemophilia, type A, is an X-linked recessive trait. A mother with hemophilia and a father
without hemophilia have a son named Rodrigo. If we tested Rodrigo's blood, the likelihood that
he has hemophilia, type A is - correct answer ✔✔ 100%
In certain breeds of cattle, having scurs is a sex-influenced trait. Having scurs is dominant in
males and not having scurs is dominant in females. If a bull (male) without scurs is crossed to a
cow (female) with scurs, what are the possible phenotypes of the offspring? - correct answer
✔✔ males with scurs and females without scurs
A strain producing white flowers (ccPP) is crossed to a different strain (CCpp) that also produces
white flowers. The F1 offspring have purple flowers. If a CCpp plant is crossed to a ccPp plant,
what is the expected ratio of phenotypes in the offspring? - correct answer ✔✔ 1 purple: 1
white
Which of the following is not likely to be a category for one of the topics in your long-term
project, which will use gene editing? - correct answer ✔✔ Cloning a mammal
