Multiple Choice
The gray crescent is the region of the amphibian egg
A) corresponding to the site of sperm penetration.
B) where gastrulation begins.
C) that was unpigmented before cytoplasmic rearrangement.
D) where the ventral lip of the blastopore develops.
E) that is formed at ovulation and prior to fertilization.
Correct Answer:

Verified
Correct Answer:
Verified
Q9: In organisms such as the chick, in
Q85: The large amount of yolk in birds'
Q86: The human embryo is able to split
Q87: One function of the allantois is the<br>A)
Q88: In a triploblastic organism,the ectoderm gives rise
Q90: If you treat unfertilized frog eggs with
Q91: Which statement about the allantois is true?<br>A)
Q92: In chick embryos,the extraembryonic membrane that forms
Q93: Sensory neurons are derived from<br>A) mesodermal tissue.<br>B)
Q94: The epiblast and hypoblast are structures found