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Sex linked

Total questions: 19

Worksheet time: 19mins

Name
Class
Date
1.

Colorblindness is a recessive X-linked disorder.

Which genotype represents a male with normal vision?

a)

XN YN

b)

Xn Yn

c)

XN Y

d)

Xn Y

2.
Which of the following genotypes belongs in the red box in the Punnett square?
a)
XBXb
b)
XbXb
c)
XbY
d)
XBY
3.

What would the genotype be of a colorblind male?

a)

XNY

b)

XNYn

c)

XnY

d)

XnYn

4.

In fruit flies, eye color is a sex-linked trait.  Red (R) is dominant to white (r).

Which genotype shows a female fly with white eyes?

a)

XRXrX^{R^{ }}X^r

b)

XRXRX^RX^R

c)

XrXrX^rX^r

5.

Which genotype shows a male with white eyes?

R = Red, r= white

a)

XrYX^rY

b)

XRYX^RY

6.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a female who is a carrier for hemophilia?
a)

XHXh

b)

XhXh

c)

XHXH

d)

XhY

7.

Who is more likely to have an X-linked trait?

a)

Males

b)

Females

c)

Both males and females

8.

Which gender has an X and a Y chromosome?

a)

male

b)

female

9.

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X R X r ?

a)

male with white eyes

b)

female with red eyes

c)

male with red eyes

d)

female with white eyes

10.

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X R Y ?

a)

male with white eyes

b)

female with white eyes

c)

male with red eyes

d)

female with red eyes

11.

Colorblindness is a recessive X-linked disorder.

Which genotype represents a male with normal vision?

a)

XN YN

b)

Xn Yn

c)

XN Y

d)

Xn Y

12.

The woman who is colorblind marries a man with normal vision. What is the probability that their sons will be colorblind?

a)

0%

b)

25%

c)

50%

d)

100%

13.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a female who is a carrier for hemophilia?
a)
XHXh
b)
XhXh
c)
XHXH
d)
XhY
14.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?
a)
XHXh
b)
XhXh
c)
XHY
d)
XhY
15.

Colorblindness is a sex-linked recessive trait. A colorblind woman marries a male with normal color vision. What is the percent chance of them having a color blind son?

a)

0%

b)

25%

c)

50%

d)

75%

16.

What is 1 examples of an X-linked genetic disorder?

a)

Huntington's Disease

b)

Down's Syndrome

c)

Colorblindness

d)

Diabetes

17.

A gene that is located on 1 of the first 44 chromosomes is called _____.

a)

autosomal

b)

x-linked

c)

dominant

d)

recessive

18.

Which best explains why males cannot be carriers of X-linked traits?

a)

Males only have one X chromosome

b)

Males have two copies of the X chromosome

c)

Males can be heterozygous for a particular trait

d)

Males do not have an X chromosome

19.

A woman who is a carrier for the sex-linked trait hemophilia has children with a man with hemophilia. What percentage of offspring would be expected to have hemophilia?

a)

0%

b)

25%

c)

50%

d)

75%