Punnett Square Practice

Multiple Choice

If one allele for a trait is dominant and the other allele is recessive, which trait will be visible? The dominant allele or the recessive allele?

• Dominant will be visible because it is blocked by the recessive allele.

• Dominant will be visible because it hides or blocks the recessive allele.

• Recessive will be visible because it is blocked by the dominant allele.

• Recessive will be visible because it hides or blocks the dominant allele.

Multiple Choice

Punnett Square #4

In plants tall is dominant to short.

Cross one heterozygous dominant with one heterozygous dominant plant.

What is the genotypic ratio?

• 1:2:1

• 2:2

• 4

• 3:1

Multiple Choice

Round seeds (R) are dominant over wrinkled seeds (r). What percentage of the offspring will be round from the following cross?
Rr X Rr

• 100%

• 75%

• 50%

• 25%

Multiple Choice

An organism that has one dominant and one recessive allele for height is _____.

• unusual

• homozygous

• mutated

• heterozygous

Multiple Choice

An organism’s physical appearance, or visible traits. 

• Genotype

• Phenotype

• Beanotype

• Notype

Multiple Choice

What does heterozygous mean?

• An organism that has the same genes for a trait (TT or tt)

• An organism that has different genes for a trait (Tt)

• When neither gene is fully dominant; offspring is a mixture of both

• the different forms of a trait (hair color--> brown, blonde, red

Multiple Choice

Cross Two Homozygous plants
(RRYY x rryy)
R = round seeds, r  = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds? 

• 0%

• 25%

• 50%

• 100%