Question

please answer all 3 questions asap

Question 1 3 pts Some of the genes important in embryonic development are dependent upon the maternal genotype rather than the genotype of the embryo. How does this maternal information get transmitted to the embryo? During egg development, pieces of maternal DNA are moved into the embryo to temporarily allow transcription and translation of maternal DNA During egg development, proteins transcribed and translated in maternal nurse cells are moved into the embryo During egg development, mRNAs transcribed in maternal nurse cells are moved into the embryo Question 2 3 pts In a Drosophila mutant, you find that the embryo has lost its dorsal/ventral patterning and has become completely "ventralized." Which of the following could lead to this type of defect? Activation of Dorsal throughout the embryo O Premature dorsal mRNA degradation O Presence of ventral mRNA throughout the embryo Null mutation in Dorsal Question 3 3 pts Bicoid is important for generation of the anterior-posterior axis by regulating expression of multiple genes, including hunchback and caudal. How does Bicoid regulate expression of these two genes? O Bicoid represses transcription of hunchback and induces translation of caudal O Bicoid inhibits transcription of hunchback and induces transcription of caudal O Bicoid induces transcription of hunchback and inhibits transcription of caudal Bicoid inhibits translation of hunchback and induces transcription of caudal Bicoid induces transcription of hunchback and inhibits translation of caudal

Answer 1

1.Option 3 is the answer.

Nurse cells trancribe mRNA's and transports those into embryonal cells.This phenomena is called Maternal gene effect.

2.Option 3 is the answer.

Embryo has become ventralized means,genes which are supposed to be expressed in ventral side has started expressing all over the embryo.

3. Option 5 is the answer.

Bicoid represses translation of caudal mRNA and enhances transcripotion of hunchbuck genes.