Grey crescent is the area:
Correct answer: B. Just opposite to the site of entry of sperm into ovum
- A. At the point of entry of sperm into ovum
- B. Just opposite to the site of entry of sperm into ovum
- C. At the animal pole
- D. At the vegetal pole
Explanation
When the sperm enters the egg during fertilization, it creates a "fertilization cone" or "fertilization cone cap" on the surface of the egg. Just opposite to this point of entry, a light-colored crescent-shaped region known as the "grey crescent" becomes visible after fertilization. The grey crescent is a significant developmental landmark that indicates the future dorsal side of the embryo. .
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Reproduction
Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
Practise Reproduction
1,220 free Reproduction MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Reproduction questions
Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?
In humans, at the end of the first meiotic division, the male germ cells differentiate into the:
A change in the amount of yolk and its distribution in the egg will affect:
Which of the following hormones is not a secretion product of the human placenta?
During embryonic development, the establishment of polarity along the anterior/posterior, dorsal/ventral, or medial/lateral axis is called:
What is true for cleavage?