Based on the Law of Dominance, we would expect _____ percent of the offspring from this cross to have large teeth.

Question

Responses
A 00
B 2525
C 7575
D 100

Answer 1

The Law of Dominance, formulated by Gregor Mendel, states that in a cross between organisms that are pure for contrasting traits (e.g., large teeth vs. small teeth), the dominant trait will appear in the offspring.

If we assume that large teeth (L) is dominant over small teeth (l), a cross between two heterozygous individuals (Ll x Ll) would yield the following genotype ratio in the offspring:

• 1 LL (homozygous dominant)
• 2 Ll (heterozygous)
• 1 ll (homozygous recessive)

This gives a phenotypic ratio of:

• 3 with large teeth (either LL or Ll)
• 1 with small teeth (ll)

Thus, 75% of the offspring would have large teeth.

The correct answer is C 75.