Biol 4003 quiz 2 with complete
solutions already passed
In snails, coiling is controlled by a maternal effect gene in which D (right) is dominant to d (left)
A female that coils to the left has offspring that coil to the right. What are the genotypes of the
mother of these offspring and the maternal grandmother, respectively - ANS ✔✔Dd, dd
A maternal effect pattern of inheritance can be explained by - ANS ✔✔nurse cells that provide
the oocytes with gene products.
With regard to a maternal effect gene, a mother is dd and her haploid oocyte (d) is fertilized by
a sperm carrying the D allele. Which gene products would be found in this fertilized oocyte? -
ANS ✔✔Only d gene products
Which of the following statements regarding epigenetics is false? - ANS ✔✔Maternal effect 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 to an
Igf2Igf2— father, what is the predicted outcome? - ANS ✔✔Half of the offspring would be
normal, and half would be dwarf.
Which of the following statements regarding the imprinting of genes (such as Igf2, PWS gene, or
AS gene) is generally correct? - ANS ✔✔Imprinting involves methylation that first occurs during
spermatogenesis or oogenesis, but not both.
In (placental) mammals such as people, the process of X chromosome inactivation first occurs -
ANS ✔✔during embryogenesis.
solutions already passed
In snails, coiling is controlled by a maternal effect gene in which D (right) is dominant to d (left)
A female that coils to the left has offspring that coil to the right. What are the genotypes of the
mother of these offspring and the maternal grandmother, respectively - ANS ✔✔Dd, dd
A maternal effect pattern of inheritance can be explained by - ANS ✔✔nurse cells that provide
the oocytes with gene products.
With regard to a maternal effect gene, a mother is dd and her haploid oocyte (d) is fertilized by
a sperm carrying the D allele. Which gene products would be found in this fertilized oocyte? -
ANS ✔✔Only d gene products
Which of the following statements regarding epigenetics is false? - ANS ✔✔Maternal effect 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 to an
Igf2Igf2— father, what is the predicted outcome? - ANS ✔✔Half of the offspring would be
normal, and half would be dwarf.
Which of the following statements regarding the imprinting of genes (such as Igf2, PWS gene, or
AS gene) is generally correct? - ANS ✔✔Imprinting involves methylation that first occurs during
spermatogenesis or oogenesis, but not both.
In (placental) mammals such as people, the process of X chromosome inactivation first occurs -
ANS ✔✔during embryogenesis.
