How many primary oocytes are present when a female infant is born? How many crossing over events occur per chromosome in meiotic division I? How many male and female gametes are required to form 100 zygotes? How does in vitro fertilization work?
Once the zygote reaches the eight-celled stage, the blastomeres arrange themselves tightly against each other; this is called “compaction”. When there are 12 to 32 blastomeres present, the structure resembles a mulberry and is now called a “morula”. The cells of the morula give rise to...
Zygotes of M. alaskensis were de-jellied by repeatedly passing them through a hand-pulled mouth pipet cut to slightly larger than the egg diameter. To prevent de-jellied eggs from sticking to plastic, Petri-dishes were coated with 1% BSA in FSW before adding eggs. For injection, de-jellied...