In a diploid organism with two alleles (A and a) at a single gene locus, which genotype is homozygous?

Which of the following describes an acrocentric chromosome?

In diploid organisms there are _______ chromosomal copies. In haploid organisms there is _______ chromosomal copy.

After a diploid cell undergoes meiosis, it divides to produce…

Answer the following questions for autosomal conditions such as PKU.

If the first child of parents who are both heterozygous carriers of a recessive mutant allele is homozygous recessive, what is the chance the second child of the couple will be homozygous recessive? What is the chance the second child will be a heterozygous carrier of the recessive mutation?