Free Printable Genetics Review #3 (sex linked and multi alleles)

Worksheets

Genetics Review #3 (sex linked and multi alleles)

Total questions: 20

Worksheet time: 19mins

Name

Class

Date

The sex of a child is determined by

whether the father's sperm contains an x or y chromosome

whether the mother's egg contains an x or y chromosome

the age of the parents

Males are more likely to suffer from a sex-linked disease or disorder because

males are the weaker sex

males have less DNA

males have 1 X chromosome, so the disorder is more likely to be expressed

When we say that a woman is a carrier for a genetic disease or disorder it means that

she has 1 gene, but not the disorder

she has 2 genes for the disorder

she can pass the gene only to male children

she can pass the gene only to female children

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

X^HX^h

X^hX^h

X^HX^H

X^hY

Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?

X^HX^h

X^hX^h

X^HY

X^hY

Males can be heterozygous for sex-linked traits.

True

False

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?

25%

50%

75%

Muscular dystrophy is a sex-linked recessive disorder. A man with muscular dystrophy marries a woman who doesn’t have this disease. Half of their daughters and half of their sons develop this disease. What is the genotype of the mother?

X^NX^N

X^NXⁿ

Xⁿ

X^N

A X-linked gene in fruit flies controls the patterns of the wings. X^B has a barred pattern and X^b doesn’t have bars. A male with barred wings is mated to a non-barred female. What would be the genotype(s) of their female offspring?

X^BX^B

X^bX^b

X^BX^b

X^Bb

10.

A woman who is colorblind has a mother with normal vision. Knowing that colorblindness is a sex-linked recessive gene, what is her mother’s genotype? What is her father’s genotype? Use X^N for normal vision and Xⁿ for colorblindness.

X^NX^N

XⁿY

X^NXⁿ

XⁿXⁿ

X^NY

11.

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

25%

50%

100%

12.

If two parents are heterozygous for type A blood, what is the probability that their offspring would have type O blood?

100 %

75%

50%

25%

13.

Jim has type AB blood. His dad could be type O.

True

False

14.

If two parents have type AB blood, what is the probability that their child will have type O blood?

25%

50%

100%

15.

If one parent is heterozygous for type A blood and the other parent is homozygous for type B blood, what is the probability they could have a child with type B blood?

25%

50%

100%

16.

If one of your parents is blood type A and the other is type B, which of the following blood types could you be?

A or B

Any of these

17.

What are the blood types of the possible children that a woman (type O) and man (type AB) can have?

O and AB

O and A

O and B

A and B

18.

True or False: You can be blood type AB because A and B are co-dominant

true

false

19.

What is the pattern of inheritance for X-linked recessive traits?

X-linked recessive traits skip a generation in inheritance.

X-linked recessive traits are passed down from carrier mothers to affected sons.

X-linked recessive traits are passed down from carrier fathers to affected daughters.

X-linked recessive traits are only passed down from affected fathers to carrier daughters.

20.

What is the probability of a male offspring inheriting an X-linked recessive disorder from his carrier mother?

75%

50%

10%

25%

Reset

Genetics Review #3 (sex linked and multi alleles)

Total questions: 20

Worksheet time: 19mins

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