Question

People who have a big toe which is shorter than their second toe are said to possess Morton's toe. This condition is caused by a dominant gene (M). It is possible for parents each possesing Morton's toe, to have a child with long, big toe? ___________ What are the chances of this ocurring? ___________

Punnet square:

Answer 1

It depends on the genotype of the parents.There can be following conditions:

1) Mother (Mm) X father ( Mm)

Male / female	M	m
M	MM (Morton's toe)	Mm(Morton's toe)
m	Mm (Morton's toe)	mm (no Morton's toe)

2 ) Mother (MM) X father (MM)

Then offspring will be all MM ( Morton's toe)

3) Mother (MM ) X Father (Mm)

Male /female	M	M
M	MM	MM
m	Mm	Mm

All will have Morton's toe.

So there are chance of their child to have long big toe.There are about 100 % chance of this occuring except in the first condition where both the parents are heterozygous.There it is about 75% chance.