Which Feature Is Characteristic of Cleavage in Placental Mammals

question 250

Multiple Choice

Which feature is characteristic of cleavage in placental mammals?

• A) Begins after the fertilized egg reaches the uterus
• B) Is slowed down by large amounts of yolk in the vegetal hemisphere
• C) Produces a spherical blastula that is one cell layer thick, similar to that of the sea urchin
• D) Has two different planes of cleavage in the second cleavage
• E) Undergoes nuclear division in the absence of cytoplasmic division during the first several division cycles

---

Definitions:

Older Brothers

Male siblings who are born before another child in the family, often playing significant roles in the dynamics and socialization of younger siblings.

Older Sisters

Female siblings who are born before another child in the family, often playing significant roles in the socialization and care of younger siblings.

Collectivist

A person who defines herself or himself in terms of relationships to other people and groups and gives priority to group goals.

Individualist

A person who defines herself or himself in terms of personal traits and gives priority to her or his own goals.