11. Sex chromosomes

Question 1

Primary step of mamalian sex differentiation
occuring at fertilization

Answer 1

chromosomal sex determination (sex chromosome)

Question 2

chromosomes in chickens

Answer 2

females - ZW
males - ZZ

Question 3

Cellular expression of testis determination factor - a protein encoded by the ____ ___

Answer 3

SRY Gene

Question 4

sex determining region of Y chromosome

Answer 4

SRY Gene

Question 5

In mammalian sex chromosomes, chromosomal content of sperm and ovum is determined after _____ stage

Answer 5

meiosis

Question 6

100% carry X chromosome

(after meiosis during oogenesis)

Answer 6

OVUM

Question 7

50% CARRY x
50% carry Y
(after meiosis during spermatogenesis)

Answer 7

SPERM

Question 8

chromatin NEGATIVE or
less chromatin mass

Answer 8

SPERM

Question 9

Chromatin positive
- Nuclei of ovum contain chromatin mass

Answer 9

OVUM

Question 10

other term for chromatin mass

Answer 10

Barr body

Question 11

AVIAN:

100% carry Z chromosome

(after meiosis during
spermatogenesis)

Chromatin negative

Answer 11

SPERM

Question 12

AVIAN:

50% carry Z
50% carry W
(after meiosis during oogenesis)

Chromatin positive

Answer 12

OVUM

Question 13

HETEROzygous chromosome in avian

ZW

Answer 13

females

Question 14

HOMOzygous chromosome in avian

ZZ

Answer 14

males

Question 15

Strict in interspecies breeding because of difference in chromosome number

Creates monsters + survivability of offspring is low

Answer 15

number of chromosomes in domestic animals

Question 16

● Ratio of male and female at conception
● # of males per 100 females

Answer 16

Primary Sex Ration

Question 17

arise from faulty sharing of sex chromosomes

Answer 17

Non-disjunctive gametes -

Question 18

carries neither X or Y chromosome

Answer 18

O sperm or O oocyte

Question 19

Non-disjunctive (abnormal):

can carry XY chromosome or O (none)
chromosome

Answer 19

SPERM

Question 20

Non-disjunctive (abnormal):

can carry XX or O (none) chromosome

Answer 20

OVUM