Lesson Eight Genetics and Heredity Test

Hair color, height, eye color and freckles are examples of human traits. What do we call the physical expression of the genetic material of an organism?

• genetics

• heredity

• genotype

• phenotype

The term that describes the display of two dominant phenotypes at the same time is...

• codominance

• incomplete dominance

• multiple alleles

• linked genes

Incomplete dominance means that the traits are

• expressed equally
• dominant
• recessive
• blended

A cross between the blue fish on the left and the yellow fish on the right results in green fish as the offspring. This is an example of...

• Incomplete dominance

• Codominance

Heredity is

• the characteristics that make all humans alike.

• the combination of information from your parents.

• the passing of traits from one generation to the next.

• what carries information about physical traits.

The person who discovered the rule of heredity is...

• Nelson Mandela

• Gregor Mendel

• Isaac Newton

• Harold Washington

A genotype that displays two different alleles for a trait is called....

• homozygous

• genetic makeup

• dominant

• heterozygous

A genotype is...

• variation

• an organism's genetic makeup, or allele combinations

• recessive

• an organism's physical appearance, or visible traits

When both alleles of a genotype are the same, the genotype is...

• homozygous

• heterozygous

Use this Punnett square to answer the question.

In horses, the gene for white hair (W) is dominant to the gene for non-white hair (w). A horse with genotype (WW) was crossed with a horse with genotype (ww), as shown in the Punnett square.

What fraction of the offspring should be expected to have white hair?

• none

• one-half

• three-quarters

• all