The Question Below Refers to the Following Information Figure 451
-Which of the Following Endocrine Structures Is (Are)not Controlled

question 35

Multiple Choice

The question below refers to the following information.
In an experiment, rats' ovaries were removed immediately after impregnation and then the rats were divided into two groups. Treatments and results are summarized in the table below
$\begin{array}{lcc}\hline&\text { Group } 1 &\text { Group } 2\\\hline (\text { Daily injections of }&&\\\text { progesterone (milligrams) } & 0.25 & 2.0 \\\text { Percentage of rats that } & & \\\text { carried fetuses to birth } & 0 & 100\\\hline\end{array}$

Figure 45.1
-Which of the following endocrine structures is (are) not controlled by a tropic hormone from the anterior pituitary?

• A)pancreatic islet cells
• B)thyroid gland
• C)adrenal cortex
• D)ovaries
• E)testes

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Definitions:

Crossing Over

A process during meiosis where homologous chromosomes exchange genetic material, enhancing genetic diversity.

Diploid Parent Cell

A cell that contains two complete sets of chromosomes, one from each parent, and is the precursor to gametes in sexual reproduction.

Double Division

A term often related to meiosis, the process by which cells divide to produce gametes (sex cells) involving two rounds of nuclear division resulting in four genetically distinct cells.

Trophoblast

A layer of cells forming the outer shell of a blastocyst, providing nutrients to the embryo and developing into a large part of the placenta.