OBJECTIVE LIFE SCIENCE
DEVELOPMENTAL BIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
What is the role of the maternal/cytoplasmic determinants?
|
|
they determine which genetic traits from the mother are passed on to the developing offspring
|
|
|
they tell the cleavage cells to migrate to the outside to form the blastula
|
|
|
they initiate gastrulation
|
|
|
they turn on the very first set of homeotic genes necessary for the earliest development
|
Explanation:
Detailed explanation-1: -Homeotic genes control the final determination of individual segments into structures in a Drosophila embryo. An example of a fly with a homeotic gene mutation would be a fly that has segments that developed into legs instead of antennae.
Detailed explanation-2: -Maternal effect genes exert their effects because the gene products are transferred from nurse cells to eggs. The gene products, mRNA and proteins, do not last a very long time before they are eventually degraded. Therefore, they can exert their effects only during early stages of embryonic development.
There is 1 question to complete.