Free Printable Genetics Review Pre-AP

Worksheets

Genetics Review Pre-AP

Total questions: 50

Worksheet time: 59mins

Name

Class

Date

Genotype refers to the ...

physical expression of the genes

possible combination of alleles in a gene

whether an allele is dominant or recessive

how an organism will appear

What is a phenotype?

The genetic make up (code)

The physical trait

having two of the same alleles for the trait (sometimes called purebred).

homozygous

hetrozygous

protein

chromosome

having two different alleles for a trait (sometimes called hybrid).

protein

homozygous

heterozygous

genotype

If brown eyes is dominant to blue eyes in sheep, and two brown eyed parents (Bb) have an offspring, what is the chance the offspring is blue eyed?

0 %

25%

50%

75%

An allele whose trait only shows up when no dominant allele is present.

hidden allele

dominant allele

recessive allele

present allele

Snapdragon flowers come in red, pink and white. What type of inheritance is this?

Complete Dominance

Incomplete Dominance

Codominance

Polygenic Inheritance

Incomplete dominance means that the traits are

expressed equally

dominant

recessive

blended

Which of the following genotypes is a purebred?

10.

If green is dominant over purple, then what is the genotype for this individual?

Purple

Green

11.

Brown fur color is dominant over black fur color. Which of the following is the actual genotype of ALL of the offspring in the next generation of this cross for fur color?
AA x aa

brown fur

12.

Tt is-

homozygous dominant

homozygous recessive

heterozygous

none of these

13.

Y for yellow body is dominant over y for blue body. What alleles would produce yellow bodies?

YY and yy

Yy and yy

YY only

YY and Yy

14.

Females=XX; Males=XY. A couple has 4 girls. What is the chance the next child will be a boy?

75%

100%

25%

50%

15.

Term for an organism that display two dominant phenotypes at the same time

codominance

incomplete dominance

multiple alleles

linked genes

16.

A chart that shows all the possible combinations of alleles that can result from a genetic cross

dominant allele

codominance

probability

Punnett Square

17.

B - black, b - brown. Two black mice mate and have some black and some brown mice. What is the genotype of the parents?

BB x Bb

BB x bb

Bb x Bb

Bb x bb

18.

What ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness?

0 in 4

1 in 4

2 in 4

4 in 4

19.

What are the possible genotypes for this cross?
(Click the picture to see it without the text)

TT = 25% Tt= 50% tt=25%

all tall

TT= 75% tt = 25%

Tt = 100%

20.

What is the dominant trait?

yellow pea seeds

green pea seeds

there is no dominant seed

Jolly green giant

21.

This is an example of ___________?

Incomplete dominance

Co-Dominance

22.

In Andalusian fowls, black individuals (BB) and white individuals (bb) are homozygous. Heterozygous individuals are grey (Bb).
Cross a black fowl with a white fowl. What is the phenotype ratio?

4 black: 0 grey: 0 white

2 black: 2 grey: 0 white

0 black: 4 grey: 0 white

0 black: 2 grey: 2 white

23.

In some carnations, flower color exhibits codominance. When crossed, Red (R) and white (W) flowers make speckled flowers (RW) that show both colors. Complete a cross between 2 speckled flowers and find the genotype ratio.

0 RR: 4 RW: 0 WW

2 RR: 2 RW: 0 WW

1 RR: 2 RW: 1 WW

0 RR: 2 RW: 2 WW

24.

this image is an example of

codominance

dominance

incomplete dominance

25.

What is NOT a possible genotype for someone with type B blood?

26.

A woman has type B blood and her husband has type O blood. What must be the woman's genotype, if they have a child with type O blood?

type B

27.

What determines gender in humans?

the X and Y chromosome

chromosome 21

codominance

epistasis

28.

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

50%

100%

25%

29.

What type of inheritance is determined by multiple genes located at different loci on different chromosomes and there can be a range of traits?

Codominance

Incomplete dominance

Polygenic traits

30.

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

31.

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

X^HX^h

X^hX^h

X^HY

X^hY

32.

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

X^BX^b

X^bX^b

X^bY

X^BY

33.

Duchenne muscular dystrophy is a recessive x-linked disorder.
According to the Punnett square, what percentage of male offspring will have the disorder?

25%

50%

100%

34.

A person with type AB blood has which genotype?

type A

I^AI^A

I^AI^B

35.

Which term(s) best describes the inheritance of human blood types?

incomplete dominance and multiple alleles

codominance and epistasis

codominance and multiple alleles

incomplete dominance and codominance

36.

The following picture represents what pattern of inheritance?

Complete dominance

Incomplete dominance

Co-dominance

Multiple Alleles

37.

In the blood type Punnett square shown, what is the probability the offspring will inherit each blood type?

50% A, 25% B, 0% AB, 25% O

25% A, 50% B, 25% AB, 0% O

50% A and 50% B

25% AB, 50% A, 25% O

38.

If an allele for blue flower color (B) and an allele for yellow flower color (Y) are incompletely dominant, what color will a BY flower be?

Blue

Yellow

Blue and Yellow

Green

39.

What goes in box 6

AaBB

AABB

aaBB

AAbb

40.

Type of Trait that is controlled by MANY genes at once. Many Genes will 'contribute' to one phenotype.

Multiple Allele Trait

Polygenic Trait

Monogenic Trait

Co-Dominant Trait

41.

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

42.

In a pedigree, what shape represents a male?

circle

square

triangle

diamond

43.

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

44.

Does this pedigree show a dominant or recessive trait?

Dominant

Recessive

45.

What percentage of all offspring will have this recessive disease?

25%

50%

75%

46.

In this Punnett square, what is the genotype of the missing parent?

47.

A parent with blood type AB and a parent with blood type O have a child. Which of the following children could be theirs?

Type O baby

Type AB baby

Type A baby

Type B baby

48.

The genotype of the female labeled X is most likely:

could be FF or ff

49.

The PARENTS of the female labeled X are most likely:

could be FF or ff

50.

Suppose Long ears (E) and short ears (e) result in medium ears (Ee)in a dog breed. What cross would result in 100% medium eared dogs?

long ears x medium ears

long ears x short ears

medium ears x short ears

medium ears x medium ears

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Genetics Review Pre-AP

Total questions: 50

Worksheet time: 59mins

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