BIOL 4003 Weeks 1-6 Quizzes with
complete solutions
True breeding tall plants with purple flowers are crossed to true breeding dwarf plants with
white flowers. The F1 plants were tall with purple flowers. 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 - ANS ✔✔9 tall/ purple flowers: 3 tall/ white flowers: 3 dwarf/ purple
flowers: 1 dwarf/ white flowers
Which event during meiosis explains Mendel's law of segregation? - ANS ✔✔separation of
homologs during anaphase 1 of meiosis
A trait exhibits incomplete dominance. If one of the two alleles is a loss-of-function allele, a
reasonable molecular explanation would be - ANS ✔✔50% of the functional protein is not
enough to give the same phenotype as 100%
Red/green colorblindness is an X-linked recessive trait. A mother who is colorblind and a father
with normal vision have a child. Assuming that the child can be male or female, what is the
probability that their child will be a male with red/ green colorblindness? - ANS ✔✔50%
A plant is heterozygous for five genes: AaBbCcDdEe. If the plant self-fertilizes, what is the
probability that an offspring will be AaBbCcDdEe? - ANS ✔✔1/32= 0.031
A female who is IAi has offspring with a father who is IBIB. Which blood type(s) would not be
possible for their offspring? - ANS ✔✔Type A and Type O.
In humans, the brown allele (B) for eye color is dominant to the blue allele (b). If a heterozygote
and a person with blue eyes have three children, what is the probability that 2 offspring will
have brown eyes and 1 will have blue eyes? - ANS ✔✔0.375
, The length of the index finger is sex-influenced. The short allele is dominant in males, whereas
the long allele is dominant in females. If a heterozygous male and a female with short index
fingers have offspring together, what are the possible phenotypes of the offspring? - ANS
✔✔males with short index fingers and females with short or long index fingers
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? - ANS ✔✔1 purple: 1 white
A maternal effect gene exists in a dominant, normal head (N) allele and a recessive, small head
(n) allele. A mother with a normal head has a bunch of offspring with small heads. What are the
possible genotypes of the mother, maternal grandmother, and offspring. - ANS ✔✔Mother: nn;
maternal grandmother: Nn; offspring: Nn or nn
What is the molecular/ cellular explanation for maternal effect? - ANS ✔✔During oogenesis,
nurse cells transfer gene products to the oocyte
With regard to a maternal effect gene, a mother is Dd and a haploid oocyte produced by the
mother is d. Which gene products would be found in this oocyte? - ANS ✔✔Both D and d gene
products
Which of the following statements regarding epigenetics is true? - ANS ✔✔genomic imprinting
is a type of epigenetic inheritance
The Igf2 gene that is inherited from the mother is silenced due to imprinting. A mutation, which
we will call Igf2-, is a loss of function mutation. If an Igf2-Igf2- mother is crossed with an
IGf2Igf2- father, what is the predicted outcome? - ANS ✔✔Half of the offspring would be
normal, and half would be dwarf
complete solutions
True breeding tall plants with purple flowers are crossed to true breeding dwarf plants with
white flowers. The F1 plants were tall with purple flowers. 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 - ANS ✔✔9 tall/ purple flowers: 3 tall/ white flowers: 3 dwarf/ purple
flowers: 1 dwarf/ white flowers
Which event during meiosis explains Mendel's law of segregation? - ANS ✔✔separation of
homologs during anaphase 1 of meiosis
A trait exhibits incomplete dominance. If one of the two alleles is a loss-of-function allele, a
reasonable molecular explanation would be - ANS ✔✔50% of the functional protein is not
enough to give the same phenotype as 100%
Red/green colorblindness is an X-linked recessive trait. A mother who is colorblind and a father
with normal vision have a child. Assuming that the child can be male or female, what is the
probability that their child will be a male with red/ green colorblindness? - ANS ✔✔50%
A plant is heterozygous for five genes: AaBbCcDdEe. If the plant self-fertilizes, what is the
probability that an offspring will be AaBbCcDdEe? - ANS ✔✔1/32= 0.031
A female who is IAi has offspring with a father who is IBIB. Which blood type(s) would not be
possible for their offspring? - ANS ✔✔Type A and Type O.
In humans, the brown allele (B) for eye color is dominant to the blue allele (b). If a heterozygote
and a person with blue eyes have three children, what is the probability that 2 offspring will
have brown eyes and 1 will have blue eyes? - ANS ✔✔0.375
, The length of the index finger is sex-influenced. The short allele is dominant in males, whereas
the long allele is dominant in females. If a heterozygous male and a female with short index
fingers have offspring together, what are the possible phenotypes of the offspring? - ANS
✔✔males with short index fingers and females with short or long index fingers
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? - ANS ✔✔1 purple: 1 white
A maternal effect gene exists in a dominant, normal head (N) allele and a recessive, small head
(n) allele. A mother with a normal head has a bunch of offspring with small heads. What are the
possible genotypes of the mother, maternal grandmother, and offspring. - ANS ✔✔Mother: nn;
maternal grandmother: Nn; offspring: Nn or nn
What is the molecular/ cellular explanation for maternal effect? - ANS ✔✔During oogenesis,
nurse cells transfer gene products to the oocyte
With regard to a maternal effect gene, a mother is Dd and a haploid oocyte produced by the
mother is d. Which gene products would be found in this oocyte? - ANS ✔✔Both D and d gene
products
Which of the following statements regarding epigenetics is true? - ANS ✔✔genomic imprinting
is a type of epigenetic inheritance
The Igf2 gene that is inherited from the mother is silenced due to imprinting. A mutation, which
we will call Igf2-, is a loss of function mutation. If an Igf2-Igf2- mother is crossed with an
IGf2Igf2- father, what is the predicted outcome? - ANS ✔✔Half of the offspring would be
normal, and half would be dwarf
