Science Test 13

the blending together of the genes for a trait results in...

• complete dominance

• incomplete dominance

• codominance

• polygenic inheritance

when both genes for a trait are expressed, the genes are...

• dominant

• recessive

• codominant

• incomplete dominant

What conclusions did Mendel draw from his experiments with pea plants?

• Offspring inherit traits in pairs of factors.

• All traits are always expressed in every generation.

• Traits are inherited randomly without any patterns.

• Only dominant traits are passed to the next generation.

If the shaded part of this pedigree represents a straight hairline, and the unshaded part represents a widow's peak, how many children have a straight hairline?

• 0

• 1

• 2

• 3

a genetic disease that causes a person's red blood cells to become hard and curved

• sickle cell anemia

• thalassemia

• hemophilia

• cystic fibrosis

DNA shape

• single helix

• double helix

• triple helix

• linear structure

How can genetic engineering be helpful?

• It can be used to treat some genetic diseases.

• It can make all plants grow in any climate.

• It can eliminate all diseases in humans.

• It can create new species of animals that do not exist.

uses lines and symbols to trace a trait from one generation to another

• genogram

• family tree

• pedigree

• chromosome map

Name 2 uses for DNA testing

• help solve crime

• help identify soldiers

• determine eye color

• predict future health issues

a genetic disease that is sometimes caused by an extra chromosome

• Down syndrome

• Cystic fibrosis

• Sickle cell anemia

• Hemophilia