Free Printable Pedigrees and Punnett Squares

Worksheets

Pedigrees and Punnett Squares

Total questions: 30

Worksheet time: 38mins

Name

Class

Date

How many generations are shown in this pedigree?

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

What does an open circle represent?

Not Affected Male

Not Affected Female

Affected Male

Affected Female

In the second generation-how many people are carriers of the trait?

Is this trait (the shaded individuals) dominant or recessive?

dominant

recessive

Give the genotype for person II-1, for this autosomal trait.

we cannot be 100% sure of the genotype

If a trait SKIPS a generation, it is an indication that the trait is....

dominant

recessive

incompletely dominant

co-dominant

If this pedigree shows an autosomal recessive disorder, what MUST the genotype of individual II-3 be?

None of the above

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?

10.

In this pedigree, the shading represents people in the family with dark hair while the unshaded represents blondes. Is dark hair controlled by a dominant or recessive allele?

Dominant

Recessive

11.

In the Punnett square shown, what must the genotype of the missing parent be?

12.

B = brown fur b = white fur
In the Punnett square, what is the probability for white fur?

25%

50%

75%

13.

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%

14.

What is the dominant trait?

yellow pea seeds

green pea seeds

there is no dominant seed

Jolly green giant

15.

What genotype would go in box 3?

16.

The blending of two traits is known as ---

incomplete dominance

codominance

17.

A condition in which both alleles for a gene are expressed so that both traits are visible is known as ---

Codominance

Incomplete dominance

18.

A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?

Incomplete dominance

Codominance

19.

If you cross a black chicken with a white chicken, only black and white checkered chickens would be produced. What kind of inheritance pattern does this follow?

Incomplete dominance

Codominance

20.

This is an example of ---

Incomplete dominance

Codominance

21.

What does this Punnett square and the probabilities of the ofspring represent?

incomplete dominance

codominance

22.

Aa, DD, bB, yy are all examples of

genotypes

phenotypes

23.

AA and Aa always show up as

dominant

recessive

24.

What you see, or the physical appearance.

Genotype

Phenotype

Homozygous

Heterozygous

25.

Aa is

homozygous

heterozygous

26.

Which of the following is homozygous dominant?

27.

Which of the following is homozygous recessive?

28.

What gender has an X and a Y chromosome?

male

female

transgender

all of the above

29.

What is the phenotype of a person with the genotype I^Bi?

type A

type O

type B

type AB

30.

A man with type AB blood is accused of being the father of a type O baby. The mother is type A. Could this man be the father?

Yes

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Pedigrees and Punnett Squares

Total questions: 30

Worksheet time: 38mins

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