Test 3: Ch. 15

Question 1

what is the word that describes that males have only one “dose” of X genes?

Answer 1

hemizygous

Question 2

during sex linkage what happens at meiosis?

Answer 2

a) XY chromosomes synapse

b) X and Y share some genes but not many

Question 3

what stage does sex linked cross though?

Answer 3

F1 Generation

Question 4

KNOW HOW TO SEX LINKED CROSS

Answer 4

LOOK AT NOTES, GIRLIE!

Question 5

WHta are sex influenced genes found on?

Answer 5

autosomes

Question 6

are X and Y chromosomes autosomes?

Answer 6

no

Question 7

why does a male and female that both have the same gene, but one ends up the more extreme? Ex) hairy ears

Answer 7

It is different because of hormones

Also, testosterone carries the hairy expression in the male

Question 8

females have a _____ dose of x-alleles but males have ____ dose

Answer 8

double, one

Question 9

to compromise for that extra dose, what does the female have because of that?

Answer 9

one x per cell in a female is inactivated

Question 10

what is a mass of inactivated X chromatin

Answer 10

BARR body

Question 11

random inactivation during what stage?

Answer 11

embryogensis

Question 12

the remaining x’s are expressed after embryogensis in what sex?

Answer 12

both male and female

Question 13

in a calico cat there are patches…

Answer 13

there are clumps that divides then produce

Question 14

what is nondisjunction?

Answer 14

when homologs dont separate at meiosis 1

Question 15

what explains how we get an euploidies?

Answer 15

nondisjunction

Question 16

KNOW THE DIAGRAM AND PROCESS OF TRYSOMME 21

Answer 16

LOOK AT NOTES

Question 17

KNOW THE DIAGRAM AND PROCESS OF Turner’s SYNDROME

Answer 17

LOOK AT NOTES