Punnett Squares - Word Problems

In plants, tall (T) is dominant to short (t). Perform the following cross: Tt x Tt. What is the probability of producing a short plant?

• 0%
• 25%
• 50%
• 75%

In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?

• rr
• R
• RR
• RR or Rr

If a heterozygous parent and a homozygous recessive parent mate, what percentage of their offspring will be dominant?

• 25%

• 50%

• 75%

• 100%

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

• 0 %
• 25%
• 50%
• 75%

In humans, having freckles (F) is dominant to not having freckles (f). What is the percent chance that a married couple with no freckles will give birth to a child who has freckles?

• 0%

• 25%

• 50%

• 75%

• 100%

In humans, having freckles (F) is dominant to not having freckles (f).

Two people with freckles get married and give birth to three children. Two of the kids have freckles and one does not.

Both parents must have which genotype?

• FF

• Ff

• ff

B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.

• they have same phenotype and genotype
• they have different genotypes and phenotypes
• they have same phenotype but different genotypes
• they have same genotype but different phenotypes

In flies, red eyes (R) are dominant to brown eyes (r). A heterozygote fly is crossed with a homozygous recessive fly. What percentage of offspring will have brown eyes?

• 25%

• 50%

• 75%

• 100%

In flies, red eyes (R) are dominant to brown eyes (r). A heterozygote fly is crossed with a homozygous recessive fly. What fraction of offpsring will be heterozygotes?

• 1/4

• 1/2

• 2/4

• 3/4

In a plant species, long stems (L) are dominant to short stems (l). A heterozygous plant is crossed with a homozygous dominant plant. What percentage of offspring will have short stems?

• 25%

• 50%

• 75%

• 0%