John doe and jane doe want to have children and are thinking about how their children's hands might look. What would their children look like if they're both heterozygous for straight pinky and hitchhikers thumb?

The correct answer would be -

Straight pinky, hitchhikers thumb - 9

Straight pinky, straight thumb - 3

bent pinky, hitchhikers thumb - 3

bent pinky, straight thumb - 1

Explanation:

Straight pinky H, hitchhikers thumb P are the dominant traits over the bent pinky h, straight thumb p. It is given that the parent's genotype is heterozygous for both then

Cross: HhPp cross with HhPp

Gametes: HP, Hp, hP, hp for both parents

punnett:

                HP       Hp         hP      hp

HP        HHPP    HHPp   HhPP   HhPp

Hp         HHPp   HHpp    HhPp   Hhpp

hP          HhPP   HhPp    hhPP    hhPp

hp          HhPp    Hhpp    hhPp    hhpp

Thus, the correct answer would be:

Straight pinky, hitchhikers thumb - 9

Straight pinky, straight thumb - 3

bent pinky, hitchhikers thumb - 3

bent pinky, straight thumb - 1