Jean Baptiste Lamarck thought that if animals, like a giraffe, stretched or strained their body parts (necks) then their offspring .

A
would still have short necks

B
would be less able to survive

C
would be identical to the parents

D
would acquire longer necks

two alleles

Explanation:

Mendelian inheritance refers to the inheritance of traits controlled by a single gene with two alleles, one of which may be dominant to the other. Not many human traits are controlled by a single gene with two alleles, but they are a good starting point for understanding human heredity