Free Printable Test 3 Genetics

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Test 3 Genetics

Total questions: 34

Worksheet time: 29mins

Name

Class

Date

How many individuals are there in the 3rd generation?

What is the mode of inheritance shown here?

Recessive because it "skips" a generation

Dominant because it shows up in every generation

On this pedigree, the allele for curly hair is dominant. The couple labeled 2 both have curly hair, but have a daughter who does not have curly hair. Therefore, we can tell from the chart that for the couple labeled 2 -

the male is heterozygous and the female is heterozygous.

the male is homozygous recessive and the female is homozygous dominant.

How many generations are shown in this pedigree?

How many kids did the mother and father from the first generation have?

If this pedigree shows a recessive disorder, what MUST the genotype of individual 4 be?

Why do all the daughters in Generation II carry the colorblind gene?

Because mom passed on the gene.

Because dad passed on the X chromosome.

In the second generation of this pedigree, how many people are carriers of the trait? *Remember: a carrier does not have the disorder/disease, but can pass it on to his/her children.

What type of heredity is shown in the pedigree?

Sex-Linked Dominant

Sex-Linked Recessive

Autosomal Dominant

Autosomal Recessive

10.

There are no carriers for Huntington's Disease- you either have it or you don't. Is Huntington's disease caused by a dominant or recessive trait?

Dominant

Recessive

11.

How many females are in this pedigree?

12.

Objective #13

This is a pedigree that follows blue eyes which is a recessive trait. What is the genotype of the father (square) in generation 1?

13.

This trait is

autosomal recessive.

autosomal dominant.

14.

Which of the following is the correct definition for a genotype?

The physical expression of a gene. (Characteristics)

A strand of DNA made up of multiple mutations.

The expression of one of your parents traits.

The set of genes in our DNA which is responsible for a particular trait.

15.

If a trait is recessive, it needs to be inherited from ___ parents to be 'expressed'.

one

both

16.

Aa, DD, bB, yy are all examples of

genotypes

phenotypes

17.

AA and Aa always show up as

dominant

recessive

18.

What you see, or the physical appearance.

Genotype

Phenotype

Homozygous

Heterozygous

19.

B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.

they have same phenotype and genotype

they have different genotypes and phenotypes

they have same phenotype but different genotypes

they have same genotype but different phenotypes

20.

What is the phenotype of the offspring? (A-Brown hair; a-blond hair)

50 % Brown Hair and 50% Blond Hair

25 % Brown Hair and 75% Blond Hair

75 % Brown Hair and 25% Blond Hair

0% Brown Hair and 100% Blond Hair

21.

Colorblindness is a sex-linked recessive disorder. A normal woman whose father was colorblind marries a man with normal color vision. What percentage of their sons will be colorblind?

25%

50%

100%

22.

Colorblindness is a sex-linked recessive disorder. If the daughter of a couple is colorblind, what are the two possible genotypes of her mother?

X^AX^A and X^AX^a

X^AX^A and X^aX^a

X^AX^a and X^aX^a

Cannot be determined

23.

What percentage of the female offspring will be a carrier for this recessive disease?

50%

100%

25%

24.

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

25.

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

X^HX^h

X^hX^h

X^HY

X^hY

26.

Colorblindness is a recessive x-linked disorder.
Which genotype represents a male with normal vision?

X^NX^N

XⁿXⁿ

X^NY

XⁿY

27.

Which of the following genotypes belongs in the red box in the Punnett square?

X^BX^b

X^bX^b

X^bY

X^BY

28.

Vitamin D resistant rickets (deformed bone formation) is a sex-linked DOMINANT trait. According to the Punnett square, what percentage of female offspring will have the disorder?

25%

50%

100%

29.

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

30.

Why is the gene for a disease or disorder more likely to be found on the X chromosome than Y?

The X chromosome has many more genes

The Y chromosome has many more genes

31.

What percentage of the offspring will have this recessive disease?

25%

50%

75%

32.

What percentage of the female offspring will be a carrier for this recessive disease?

50%

100%

25%

33.

Look at this cross: X^BX^b x X^BY

What proportion of the male children are colorblind?

100%

75%

50%

25%

34.

Look at this cross: X^BX^B x X^bY

What proportion/percent of the male children are colorblind?

100%

75%

25%

Reset

Test 3 Genetics

Total questions: 34

Worksheet time: 29mins

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