Genetics Practice Problems

​Complex Inheritance Practice Problems

Some text here about the topic of discussion

Draw

Draw a Punnett square showing a cross between the blue-eyed man and a brown eyed woman whose father has blue eyes. (remember brown is completely dominant to blue)

Fill in the Blanks

Based on your Punnett Square,

% of the offspring from this cross will have blue eyes.

Open Ended

Explain the difference between incomplete dominance and codominant.

Multiple Choice

In some chickens, the gene for feather color is controlled by codominance.  The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette.​

What is the genotype for black chickens?​

• Black

• BB

• BW

• WW

Multiple Choice

In some chickens, the gene for feather color is controlled by codominance.  The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette.​

What is the genotype for white chickens?

• White

• BB

• BW

• WW

Multiple Choice

In some chickens, the gene for feather color is controlled by codominance.  The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette.​

What is the genotype for erminette chickens?

• Erminette

• BB

• BW

• WW

Draw

Draw a Punnett Square the shows the cross between two Erminette chickens.

Match

Based on the Punnett square showing the cross between two erminette chickens, Match the following

• Probability offspring will be black

• Probability offspring will be Erminette

• Probability offspring will be white

25%

50%

25%

• 25%

• 50%

• 25%

Fill in the Blanks

A black chicken and a white chicken are crossed.  What is the probability that they will have erminette chicks?

Match

In snapdragons, flower color is controlled by incomplete dominance.  The two alleles are red(R) and white(r).  The heterozygous genotype is expressed as pink. Match each genotype with its correct phenotype.

• RR

• Rr

• rr

Red

Pink

White

• Red

• Pink

• White

Draw

Draw a Punnett Square showing the cross between a pink flower and a white flowered plant.

Multiple Choice

A pink flower is crossed with a white flowered plant. What is the probability of producing a pink flowered plant?

• 0%

• 25%

• 50%

• 100%

Draw

What cross will produce the most pink flowered plants? Show the Punnett square to support your answer.

Match

Blood type: Match the following genotypes to the correct phenotypes

• ii

• Ai, AA

• BB, Bi

• AB

Type O

Type A

Type B

Type AB

• Type O

• Type A

• Type B

• Type AB

Draw

Draw a Punnett Square to show this cross: a mother who has O blood type with a male that has homozygous A blood type. 

Open Ended

Cross a mother who has O blood type with a male that has homozygous A blood type.  What is the genotype and phenotype of the offspring?​

Open Ended

What are the possible blood types of a child whose parents are both heterozygous for Type B blood?

Draw

Draw a Punnett Square to show a cross between mother who is a carrier of colorblindness with a father who has colorblindness. 

Multiple Choice

What percentage of the MALE offspring are expected to be colorblind?

• 100%

• 50%

• 0%