Mendelian Genetics

Round (R) and yellow (Y) are dominant traits. Based off this Punnett square, what fraction of the offspring will have wrinkled, yellow seeds?

• 9/16

• 3/16

• 1/16

• 16/16

In pea plants, round seeds (R) are dominant to wrinkled seeds (r). Which of the following represents the genotype of a pea plant that is homozygous dominant?

• RR

• round

• Rr

• wrinkled

• rr

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

• recessive
• dominant
• lower case letter
• both 

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

• 0 %
• 25%
• 50%
• 75%

Black fur in mice (B) is dominant to brown fur (b).

Short tails (T) are dominant to long tails (t).

What percentage of the offspring of the cross BbTt x BBtt will have black fur and long tails?

• 0%

• 25%

• 50%

• 100%

What are the possible alleles a parent with the GgBb genotype could donate to their gametes? (Hint: F.O.I.L.)

• GB, Gb, gB, gb

• GB, GB, gb, gb

• Gb, Gb, Gb, GB

• GG, BB, gg, bb

Aa, DD, bB, yy are all examples of

• genotypes
• phenotypes

What is the phenotypic ratio of a dihybrid cross of 2 heterozygous parents?

• 3:4:3:6

• 1:2:3:4

• 9:3:3:1

• 8:4:3:1

Heterozygous is when...

• the alleles are the same
• the alleles are different
• the alleles are absent
• the alleles are present

B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 

• 0%
• 25%
• 50%
• 75%