The frog life cycle

Question 1

Estrogen’s role?

Answer 1

a hormone that can instruct the liver to make and secrete the yolk proteins, which are then transported through the blood into the enlarging eggs in the ovary.*

The yolk is transported into the bottom portion of the egg

Question 2

Pituitary gland

Answer 2

the small pea-sized gland that plays a major role in regulating vital body functions and general wellbeing. It is referred to as the body’s ‘master gland’ because it controls the activity of most other hormone-secreting glands.

Question 3

Progesterone’s role

Answer 3

Signals the egg to resume its meiotic
division.
This is necessary because the egg had been “frozen” in the metaphase of its first meiosis

Question 4

Notochord

Answer 4

A rod of mesodermal cells in the most dorsal portion of the embryo that tells the ectodermal cells above it that they are not going to
become skin

Question 5

Neurula

Answer 5

Early vertebrate embryo which follows the gastrula and in which nervous tissue begins to differentiate and the basic pattern of the vertebrate begins to emerge.

Question 6

Vegetal hemisphere of the egg

Answer 6

the bottom half of the egg usually contains the yolk, it divides more slowly
(because the large yolk deposits interfere with cleavage)

Question 7

Animal hemisphere of the egg

Answer 7

the upper half of the egg usually has less yolk and divides faster