Question

name:
biol 105 exam 4
please write your name on the scantron sheet. each question has only one co
do not rush through this exam. good luck.

1. humans have how many autosomes?

a. 22 pairs
b. 23 pairs
c. 44 pairs
d. 46 pairs

1. the sex chromosomes found in a typical male are:

a. xx.
b. xy.
c. yy.
d. y.

1. the sry gene on the y chromosome is responsible for:

a. female genitalia.
b. ovary suppression.
c. estrogen production.
d. testes development.
why can it be said that males determine the sex of their children?
a. males have two x chromosomes, so whichever one is passe
b. males will either contribute an x or a y chromosome, wher
chromosome.
c. male chromosomes are inherited preferentially over femal
d. y chromosomes are dominant; x chromosomes are recess

Explanation:

• Question 1: Humans have 46 chromosomes in total. Among them, 22 pairs are autosomes (non - sex chromosomes), and 1 pair is sex chromosomes.
• Question 2: In typical human males, the sex chromosomes are XY. Females have XX sex chromosomes.
• Question 3: The SRY (Sex - determining Region Y) gene on the Y chromosome is crucial for testes development. It initiates the male sex - determination pathway.

Answer:

1. A. 22 pairs
2. B. XY
3. D. testes development