Short necks in giraffes is a recessive trait with 40 penetra

Short necks in giraffes is a recessive trait with 40% penetrance. What is the chance of two heterozygous individuals producing an offspring with a short neck?

2.5%

25%

10%

12.5%

5%

Solution

Short necks in giraffes is a recessive trait with 40% penetrance. What is the chance of two heterozygous individuals producing an offspring with a short neck?

2.5%

b.

25%

c.

10%--------answer

d.

12.5%

e.

5%

Long neck -------dominant ---------G allele

Short neck -------recessive ---------g allele

heterozygous individuals Gg     x Gg heterozygous individuals

G

g

G

GG

Gg

g

Gg

Short neck ------- gg

Short neck =1/4 =0.25

Long nekc=3/4=0.75

penetrance =0.40

. What is the chance of two heterozygous individuals producing an offspring with a short neck?

=0.25 x 0.40 =0.1=10% -answer