Unit 3 Test 1

Consider the possible genotypes of the offspring of two heterozygous brown goats. The ratio of brown to white offspring in this case would be

• 1:3

• 2:2

• 3:1

This is the study of biological inheritance

• biology

• ecology

• genetics

A(n) _____ is one of two or more alternate forms of a gene.

• allele

• altergene

• genotype

According to the Punnett Square: B represents the dominant gene for blue feathers and b represents the recessive gene for red feathers. Two heterozygous birds have one offspring. What % chance does it have for red feathers?

• 0%

• 25%

• 75%

Which describes a trait from a recessive gene?

• it causes a mutation

• it masks a dominant gene trait

• it usually appears only if it is homozgyous

In the chart, the recessive trait is

• no teeth

• large teeth

• small teeth

Two genetically identical plants were crossed. The genotypic ratios of offspring are seen in the Punnett square. What % of the offspring should look like the parents?

• 0%

• 50%

• 75%

In pigs, the allele for a wavy, rough coat (R) is dominant to the allele for a soft, fine coat (r). A rough coat boar and a soft coat sow mate. They reproduce several litters, 50% are rough coat and 50% are smooth coat. What were the genotypes of the parents?

• RR * rr

• Rr * rr

• RR * Rr

Among a species of butterflies, the color blue (B) is a dominant trait. Yellow color (b) is a recessive trait. If a pure blue butterfly (BB) mates with a pure yellow (bb), what will the offspring look like?

• they will all be blue

• they will all be yellow

• half will be blue and half will be yellow

All BUT one of these traits are determined by chromosomes. That is

• the color of her eyes

• how tall she is

• how long her hair is