The ovum is surrounded by the corona radiata which contains:

In humans, the _________ facilitates implantation into the uterine wall.

The ectoderm layer eventually develops into the:

The human zygote goes through many cell divisions while traveling to the uterus. The zygote has ________ chromosones in each cell nucleus.

Which of the following placental hormones is a likely contributor tothe insulin resistance of the pregnancy?

The trophoblast produces _________, which maintains the corpus luteum and prevents menstruation.

Sex linked traits affect more males than females

Which of the following choices is the correct order of embryonic stages?1. Blastula2. Zygote3. Morula4. Gastrula

This is also termed as “reduction division”, because it reduces the number of chromosomes in half 

This period is the most susceptible to teratogens