. In humans, polydactyly is a condition where a person has extra fingers or toes. The allele that causes this trait is dominant. A person with Dd or DD will have extra digits. Fill out the pedigree of this family where polydactyly has been observed.

https://prnt.sc/q4cm2n

I don't know how to start to be honest

Question

. In humans, polydactyly is a condition where a person has extra fingers or toes. The allele that causes this trait is dominant. A person with Dd or DD will have extra digits. Fill out the pedigree of this family where polydactyly has been observed.

https://prnt.sc/q4cm2n

I don't know how to start to be honest

iosangel · Answer

Also 
 In each pedigree, a male is represented by a square and a female is represented by a circle. If the shape is shaded, that indicates that the individual displays the trait being studied.

Vocaloid · Answer

this trait is inherited through the autosomes so the inheritance doesn't depend on sex. so, you don't need to consider the shapes when determining inheritance, just the alleles.

all the white circles and squares have to be dd since the trait is not present 
any black circle or square has to be either DD or Dd. to choose between them, consider what offspring are possible for different crosses. For example, the first line has a white square (dd) and a black circle (DD or Dd). their offspring consists of people with and without the trait.

DD x dd ---> Dd only ---> all polydactyl children
Dd x dd ---> Dd and dd are both possible ---> about half are expected to have the trait, half aren't

so the black circle on the first row has to be Dd

continue with this logic for all the shapes

iosangel · Answer

Like this? https://prnt.sc/q4fx7l