Genetics Quiz

If an organism has 2 identical alleles for a particular trait then it is

• heterozygous

• homozygous

• hybrid

A pea plant that has 2 different alleles for a trait means they are

• homozygous

• heterozygous

• purebred

How many recessive alleles for a trait must an organism inherit in order to show that trait?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-LS3-1

What is an allele?

• same forms of a gene

• different forms of a gene

• 3 letters

Tags

NGSS.HS-LS3-2

If the parents are X H X h and X h Y, then what is the percentage that the children will have the recessive trait.

• 50%

• 25%

• 75%

If a Heterozygous Rr pea plant is crossed with a Heterozygous Rr pea plant, what would be the percentage that the offspring will be recessive rr?

• 50%

• 75%

• 25%

Type A (Ai) blood X type O (ii) blood

what would be the percentage that their offspring would be Type A blood?

• 25%

• 50%

• 100%

When 2 dominant alleles are both expressed are said to be

• codominant

• incomplete dominant

• dominant

If a pink flower is crossed with a pink flower, what percent of their offspring are expected to be pink-flowered?

R= Red r= White

• 50%

• 25%

• 100%

If 1 red and 1 white flower is crossed, what percent of their offspring are expected to be pink-flowers?

R= Red r= white

• 50%

• 75%

• 100%

• 25%