Chapter 9: Part 1 Chromosomes and Gonads

Question 1

how many pairs of chromosomes do cells have?

Answer 1

23. chromosomes

Question 2

what is a gamete?

Answer 2

a mature reproductive cells; a sperm or ovum

Question 3

what are the two types of sex chromosomes?

Answer 3

X and Y

Question 4

what chromosomes do females have?

Answer 4

XX

Question 5

what chromosomes do males have?

Answer 5

XY

Question 6

what are the three general categories of sex organs?

Answer 6

gonads, internal sex organs, and external genitalia

Question 7

What are gonads?

Answer 7

they are the testes or ovaries, they are the first to develop

Question 8

what are the functions of gonads?

Answer 8

produce ova or sperm, secretes hormones

Question 9

up to ___ week, male and female fetuses are the same.

Answer 9

6th week

Question 10

what is Sry?

Answer 10

it is a gene located on the Y chromosome that instructs fetal gonads to develop into testes, if sry is not present…. it becomes ovaries…

Question 11

If sry isn’t present on the Y chromosome of a male, what happens?

Answer 11

ovaries develop, they become XX males

Question 12

what are organizational effects?

Answer 12

during prenatal development hormones influencing the development of a person’s sex organs and brain, determines individuals gender, are parmenant

Question 13

what is activation effect?

Answer 13

hormones that cause effects later in life. ex. activating the production of sperm