Genetics Unit Review

Two blue butterflies met on a daisy. They are both heterozygous for their blue (B) wing color, which is dominant over yellow(b) wing color. Create a Punnett square to show the possible results of their offspring. 7.L.4A.3

What are the chances of baby butterflies with blue wings?

• 25%

• 75%

• 100%

1. In Mendel’s famous experiments with garden peas, purple flowers are dominant over white. What would be the phenotypic ratio of the cross at below? 7.L.4A.3

• purple/white, 1:1

• purple/white, 1:2:1

• purple/white, 3:1

• purple/white, 1:3

1. Referring to Mendel’s famous experiments with garden peas, purple flowers are dominant over white flowers. Which of answer choices BEST describes the genotypic ratio of the cross at right? 7.L.4A.3

• one homozygous dominant, two heterozygous, and one homozygous recessive

• three heterozygous and one homozygous recessive

• three homozygous dominant and one homozygous recessive

1. Study the image below. This is an example of what type of inheritance? 7L.4A.3

A. Complete dominance

B. Incomplete dominance

Co-dominance

• Complete dominance

• Incomplete dominance

• Co-dominance

The physical expression of a gene e.g. brown eyes

• Homozygous

• Heterozygous

• Genetics

• Phenotype

Homozygous individuals have 2 identical alleles?

• True

• False

Answer explanation

Homo means same

If a trait is sex-linked, the gene is found on the autosome.

• True

• False

Answer explanation

Sex-linked means on the X chromosome. All other chromosomes beyond X & Y are called autosomes.

Which of the following is the genotype for a heterozygous individual?

• RR

• Rr

• rr

• Red

Answer explanation

Hetero means different

When several genes influence a characteristic, the characteristic is said to be?

• Polygenic

• Co-Dominant

• Incomplete Dominant

• Complete Dominat

Answer explanation

Poly means many

Which of the following patterns can result in an intermediate trait, such as pink flowers when crossing red and white flowers.

• Sex-linked Alleles

• Complete Dominance

• Incomplete Dominance

• Co-Dominance

Answer explanation

Incomplete results in a blending of the two traits