Genetics Quiz

In domesticated dogs, hair type is controlled by two different alleles. The allele for wire hair is (H) and the allele for smooth hair is (h).

When two heterozygous dogs are crossed, what percentage of the offspring is expected to be homozygous for smooth hair?

• 50%

• 75%

• 25%

• 0%

A genetic cross involving two unlinked genes is represented.

AaGG x aaGg

Which genotype is NOT possible in the offspring produced by the cross?

• AaGG

• Aagg

• aaGg

• aaGG

Achondroplasia is an inherited condition that affects the formation of bone in humans. The allele for achondroplasia (A) is dominant to the unaffected allele (a).

If a person who is homozygous dominant has children with a person who is homozygous recessive, what percentage of their children will likely have achondroplasia?

Enter your answer in the box. Your answer must be a whole number.

In Pea plants, tall (T) is dominant to short (t). Red flowers (R) are dominant to White Flowers (r).

What are my chances of having a Tall Pea plant with Red flowers if I cross these two plants: (TtRr x TtRr)?

In Goldfish, the color Gold (GG) is dominant to White (WW). Goldfish show CoDominance with these colors. If a Golden Goldfish crosses a White Goldfish, the result is a Spotted Goldfish (GW).

What are the correct Phenotype percentages of crossing two Spotted Goldfish?

• Gold: 25%

  White: 25%

  Spotted: 50%

• Gold: 50%

  White: 0%

  Spotted: 50%

• Gold: 0%

  White: 25%

  Spotted: 75%

• Gold: 50%

  White: 50%

  Spotted: 0

In Chickens, White Feathers (F) are dominant to Brown Feathers (f). Large Wattles (W) are dominant to Small Wattles (w).

Which of these genotypes belongs to a Brown Chicken with Large Wattles?

• FfWW

• FFww

• ffWW

• ffww

In Pea plants, Tall is dominant to short.

A Homozygous Tall Pea Plant is crossed with Heterozygous Tall Pea plant.

What are the chances I can get a short plant from this crossing?

• 75%

• 25%

• 0%

• 50%

Bloodtypes have a different array of alleles and factors.

Using the chart in the picture, what are the percentages of the crossing between a man and woman who both have a TYPE O blood type?

• A: 0%

  B: 0%

  AB: 0%

  O: 100%

• A: 0%

  B: 0%

  AB: 25%

  O: 75%

• A: 50%

  B: 25%

  AB: 0%

  O: 25%

• A: 25%

  B: 25%

  AB: 25%

  O: 25%