Lecture 7= 9/25

Question 1

Primary sexual differentiation

Answer 1

involves only the gonads (where gametes are produced).

Question 2

secondary sexual differentiation

Answer 2

: involves the overall appearance, including external genitalia, mammary glands, etc.

Question 3

Unisexual, dioecious, gonochoric

Answer 3

refer to an individual containing only male or female reproductive organ.

Question 4

bisexual

Answer 4

refer to an individual containing both male and female reproductive organs. They can produce fertile gametes of both sexes.

Question 5

intersex

Answer 5

individuals of intermediate sexual differentiation, who are most often sterile.

Question 6

heterogametic sex

Answer 6

X Y

Question 7

homogametic sex

Answer 7

X X

Question 8

Klinefelter

Answer 8

XXY, caused by nondisjunction in mother

Question 9

males with multiple X chromosome

Answer 9

similar to Klinefelters but symptoms are much more severe

Question 10

XYY

Answer 10

no distinguishing morphology (not a syndrome)

Question 11

Turner Syndrome

Answer 11

XO, nondisjunction

Question 12

females with multiple X chromosomes

Answer 12

more X’s, more physical characteristics

Question 13

TDF

Answer 13

sex is determined by the presence of TDF, not Y chromosome,

XX males are possible if the SRY gene translocated onto an autosome

Question 14

SRY

Answer 14

transcription factor that binds to DNA and regulates the expression of some genes

Question 15

sex ratio is not exactly one

Answer 15

sperm may be lighter and therefore produce higher number of zygotes

Question 16

bar body

Answer 16

inactivated X chromosome, portrays dosage compensation

Question 17

temperature sex determination

Answer 17

temperature sensitive expression of hormones

Question 18

dosage compensation

Answer 18

achieved by random inactivation of one of the x chromsomes