Deck 7 (slides 34-39)

Question 1

In X-Chromosome _________ in female cells, 1 X chromosome is randomly switched _____, forming a sense region in the nucleus known as a _______ _______.

Answer 1

Inactivation, off, Barr, Body

Question 2

This is not found in males’ cells because they have only ___ X chromosome.

Answer 2

1

Question 3

In X-Chromosome _________ in cats, a gene that controls ________ _______ color is located on the X chromosome.

Answer 3

Inactivation, coat, spot

Question 4

One X may have the allele for _______ spots and another may have the allele for _______ spots.

Answer 4

Orange, black

Question 5

In some parts of the body, the X with orange spots is turned _____.

Answer 5

Off

Question 6

In other parts of the body, the X with black spots is turned _____.

Answer 6

Off

Question 7

Male cars can only have spots with _____ color.

Answer 7

1

Question 8

If you see a car with ___ color spots (white with orange and black), it must be a _______ cat.

Answer 8

2, female

Question 9

The most common error in meiosis is _________ disorders, occurring when homologous chromosomes _____ to separate.

Answer 9

Chromosomal, fail

Question 10

These failures to separate are called ___________ (“not coming apart”).

Answer 10

Nondisjunctions

Question 11

Nondisjunction causes gametes to have an ________ number of chromosomes.

Answer 11

Abnormal

Question 12

This can cause a chromosomal ________ disorder in an organism (such as a trisomy-having ___ of a chromosome instead of 2).

Answer 12

Number, 3

Question 13

An example of a nondisjunction disorder is _______ _________-the most common trisomy.

Answer 13

Down Syndrome

Question 14

Someone with Down Syndrome has copies of chromosome _____ (____ total chromosomes).

Answer 14

21, 47

Question 15

Down Syndrome usually involves a nondisjunction of chromosome ____ in an _____ cell (especially in woman over the age of ____).

Answer 15

21, egg, 30

Question 16

Down Syndrome produces mild-to-severe _______ ________.

Answer 16

Mental retardation

Question 17

Down syndrome affects approximately ___ baby in ______.

Answer 17

1, 800

Question 18

A female with only ___ X chromosome (45 total chromosomes) have _________ Syndrome.

Answer 18

1, Turner’s

Question 19

Another nondisjunction disorder: In a female with Turner’s Syndrome, the ______ ________ do not develop at puberty, leading to _________.

Answer 19

Sex, organs, sterility

Question 20

Another nondisjunction disorder: _________ Syndrome is when a male has chromosomes ___ ___ ___ (47 total chromosomes), leading to ________ with some feminine features.

Answer 20

Klinefelter’s, XXY, sterility