Unit 4: Genetics Test B

Two black guinea pigs were crossed and they produced a litter of 4 black and 3 white guinea pigs. Which best explains this occurrence?

• White fur is dominant to black fur.

• White fur was the result of a mutation.

• Both parents were heterozygous for black fur.

Freckles (F) are dominant to not having freckles (f). The diagram shows the cross of a homozygous dominant parent (FF) with a parent of an unknown genotype for freckles.

What is the unknown genotype and phenotype for the parent?

• homozygous dominant with freckles

• homozygous recessive without freckles

• heterozygous with freckles

Which most accurately describes all behavior?

• All behavior is affected only by experience.

• All behavior is affected only by inheritance.

• All behavior is affected by both experience and inheritance.

Use the Punnett square to answer the question that follows.

In a monohybrid cross between two organisms heterozygous for a particular trait (Ff), what would be the predicted ratio of the offspring's genotypes?

• 1 FF: 3 Ff: 1 ff

• 1 FF: 2 Ff: 1 ff

• 2 FF: 2 Ff

In some plants, red flowers are dominant (R) and white flowers are recessive (r). Two plants are crossed and the offspring have a possibility ofred flowers andwhite flowers. Which Punnett square shows the cross and its offspring?

• 
• 
• 

When an allele is expressed in the phenotype even if only one copy is present.

• Homozygous

• Dominant

• Recessive

The term used to describe two different forms of the same gene.

• Alleles

• Recessive

• Heterozygous

A couple has three children: a 14 year old daughter and two sons that are 12 and 10 years old. If the mother and daughter are know to have the genetic disorder, what would the pedigree of this family look like?

• 
• 
• 

Below are some influences on a person’s quality of life.

Which is least controlled by human behavior?

• 1

• 2

• 3

The Punnett square shows the cross between cabbage butterflies. B = white and b = yellow.

Why are all the offspring white?

• Both parent butterflies were dominant for white color.

• Only one parent butterfly carried recessive yellow traits.

• Only one parent carried dominant and recessive color genes.