AP BIOLOGY

Detailed explanation-1: -It takes only one sperm to fertilize the egg. This fertilized egg is now called a zygote and contains 46 chromosomes-half from the egg and half from the sperm. Genetic material from the male and female combine so that a new individual can be created.

Detailed explanation-2: -The sperm unites with (fertilizes) an ovum (egg) of the female to produce a new offspring. Mature sperm have two distinguishable parts, a head and a tail. The head of the sperm varies in shape for each animal species.

Detailed explanation-3: -Sexual reproduction requires two parents. Each parent contributes a gamete-a sex cell that has half of the normal DNA of a regular body cell. In males, the gametes are sperm and in females, the gametes are eggs.

Detailed explanation-4: -(range equals 1.4 to 6.3 times 10(6) per gm.). Based on our total sample (23 patients) 67 per cent of the men 20 to 50 years old probably produce between 45 times 10(6) and 207 times 10(6) spermatozoa per day. Daily spermatozoal production was normal in 1 vasectomized man.

Detailed explanation-5: -Sexual reproduction occurs when the sperm from the male parent fertilizes an egg from the female parent, producing an offspring that is genetically different from both parents.