Tagged Questions
3
votes
1answer
158 views
Does chicken embryo form the disc called “discoblast” in the cleavage and blastulation of chicken?
This thread is related to my previous thread which is still unsolved mainly. I need to be able to compare chick and human cleavage and blastulation of zygote.
My friend says that
Chicken have ...
6
votes
1answer
294 views
What forms the human amniotic sac?
I am trying to understand the formation of embryonic disc for human and chick so the following question is related to here about formation of embryonic disc.
I had thought that the amniotic sac forms ...
3
votes
1answer
193 views
Where does meiosis II of oogenesis end exactly in tuba uterina - uterus?
I know that metaphase II ends at ampulla tuba uterina, but I am not completely sure where the telophase II ends. Is it in the triangular section of cervix uterii?
I just have an intuition that the ...
2
votes
1answer
97 views
Why are Birds and Reptiles with abundant yolk sac polyspermic?
I was given an explanation that birds and reptiles are polyspermic because they have an abundant yolk sac. But how does it explain the thing?
Chicken as an adult is not using in my opinion yolk as an ...
5
votes
1answer
115 views
When does Coelom form exactly?
Related to my other question.
I know that the coelom is derived from mesoderm.
Coelom seems to form during organogenesis within 3rd and 8th week of embryogenesis.
However, that answer is not either ...
4
votes
1answer
930 views
Do humans have Coelom?
Kimball Biology 5e says
Coelom is the main body cavity of many animals. It is lined with an epithelium derived from mesoderm.
Gilbert Embryonal Biology 9e says
Coelom is the space between ...
4
votes
1answer
850 views
What are differences between formation of embryonic disc in chick and mammal embryo?
Exam question which got lowest average points in my university: 1/5 average.
No markscheme available so my attempt below.
I assume that embryonic disk prefers to germ disk such that Formation prefers ...
5
votes
1answer
85 views
What is the total number of rounds of cleavage during mammalian embryonic development?
That for frog is 12, but what about mammalian embryos?
I cannot find the exact number anywhere.
