Which of the following is true with regard to sources of variability?
A)The chromosomes in the zygote are not exact copies of those in the mother's ovaries and the father's testes.
B)Fraternal twins develop from a single zygote that splits into two genetically identical replicas.
C)For each genotype,only a corresponding phenotype can be expressed.
D)Identical twins develop from separate eggs and separate sperm.

Question

Quizplus · Accepted Answer

The chromosomes in the zygote are not exact copies of those in the mother's ovaries and the father's testes.During the formation of the sperm and egg in meiosis,the members of each pair of chromosomes are separated,but which chromosome in the pair goes to the gamete is a matter of chance.In addition,before the pairs separate,pieces of the two chromosomes in each pair are exchanged,creating a new combination of genes on each chromosome.

Which of the Following Is True with Regard to Sources