biology, help me please!!?

Question

1. explain why the chromosomes in the haploid cells that are produced by meiosis 1 looks diffrent from those produced by meiosis 2.

2. explain how it might happen that a human offspring with 47 chromosomes could be produced.

3. in humans, the egg is larger than the sperm. explain how it is possible that a child inherits equally from its mother and father.

Answer 1

1. In meiosis 1 the chromosomes are composed of two chromatids held together by a centromere. In meiosis 2 the cells contain "single chromosomes"(formally chromatids).

2.The result of a nondisjunction of autosomes or sex chromosomes during gametogenesis and the subsequent
fertilization involving these aberrant gametes.

3.
The egg is larger than the sperm only because of its stored food. The nuclei of both gametes are about the same size,and fertilization involves the uniting of the nuclei.