Genetic combinations/Heredity

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%

Which of the following is homozygous dominant?

• Yy
• Y
• yy
• YY

What genotype is missing from this Punnett Square?

• RrYy
• RRYY
• rryy
• RrYY

A male beetle has the genotype Ttbb. If this beetle mates with a female with genotype TTBb, what is the chance their offspring will have the genotype TtBb?

• 12.5%
• 25%
• 50%
• 75%

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

What are the possible genotypes for this cross?

• TT = 25% Tt= 50% tt=25%
• all tall
• TT= 75% tt = 25%
• Tt = 100%

In the Punnett square shown, which of the following is true about the offspring resulting from the cross?

• About half are expected to be short.
• All are expected to be short.
• About three fourths are expected to be tall.
• All are expected to be tall.

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%

Tt X Tt
What percentage of the offspring will be short?
T = tall 
t = short

• 100%
• 75%
• 50%
• 25%

A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. What percentage of the offspring will be homozygous recessive?
R = round
r = wrinkled

• 75%
• 50%
• 25%
• 0%