In birds, sex determination:
a) is opposite to that of humans, in that the mother has one copy of each of two different sex chromosomes.
b) is similar to that of humans, in which the father has one copy of each of two different sex chromosomes.
c) is based on the males being diploid and the females being haploid.
d) is based on the males being haploid and the females being diploid.
e) is based on temperature.
Answer: a) is opposite to that of humans, in that the mother has one copy of each of two different sex chromosomes.