in genetics ?? plz help me to answer this question ??

Question

Assume that the trait in accompanying pedigree is due to simple Mendelian inheritance.
a) Is it likely to due to a dominant allele or a recessive allele? Explain.
b) What is the meaning of the double horizontal line connecting 111-1 with 111-2?
c) What is the biological relationship between 111-1 and 111-2?
d) If the allele responsible for the condition is rare, what are the most likely genotypes of all of the persons in the pedigree in generations 1, 11 and 111? (Use A and a for the dominant and recessive alleles, respectively)?

Answer 1

We can't answer this question without seeing the pedigree.

However, you can probably tell if the trait is dominant or recessive.
Recessive if someone in the pedigree has the trait, but their parents do not. Also recessive if someone in the pedigree is a carrier, indicated by a dot in the circle or square or by shading just half of the circle or square.

Answer 2

umm we actually have to see the pedigree to help you