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if a man who is heterozygous for hitchhiker's thumb marries a woman who is also heterozygous for hitchhiker's thumb, predict the potential genotypes and phenotypes for the offspring for that trait

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Hitchhicker's thumb is a condition in which a person is able to bend his thumb backwards. This trait can be seen in many people but the condition is recessive, which means a person needs two alleles for hitchhiker's thumb to have this particular characteristics. The gene for straight thumb is commonly indicated by T while that for hitch hicker's thumb is indicated by t.

Let's see what will happen if a person heterozygous for hitchhiker's thumb marries a woman who is also heterozygous for hitchhiker's thumb.

P1: Tt X Tt

Gametes: t T : t T

Offsping : TT : Tt : tT : tt

TT : 25 % : Straight thumb

Tt + tT : 50% : Straight thumb

tt : 25% : Hitch hicker's thumb

Therefore, there are 25 % chances that their offspring will have Hitch hicker's thumb and 75 % chances that they will have straight thumb.

Hope it help!

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