Question

Name:

Per
4. Dragons have either smooth or wrinkled noses. Wrinkled is dominant over smooth. If a smooth-nosed
female dragon is crossed with a heterozygous wrinkle-nosed male, how many of their offspring are likely
to have smooth noses?
a) genotypic ratio:
b) phenotypic ratio:
c) What is the probability of having smooth-nosed offspring?
d) What is the probability of having two smooth-nosed offspring?

Answer 1

Let's draw a punnet square to check for the results.

w w

W Ww Ww

w ww ww

a) 2:2 are likely to have smooth nose. 2:2 are likely to have wrinkled nose ( heterozygotes).

b) 2:2 are likely to have smooth nose. 2:2 are likely to have wrinkled nose.

c) 50% is the probability of having smooth-nosed offspring.

d) 50% is the probability of having two smooth-nosed offspring.