Hereditary Determination of Sex Primary sex determination- Concerns the determination of the gonads. In mammals, determination strictly chromosomal; not influenced by the environment. Most cases- female = XX; male= XY Every individual organism has atleast one X Chromosome. Since the female has 2 X chromosomes, each of her eggs posses one X chromosome. The male posses an X and a Y, so therefore the male can produce 2 kinds of sperm, one with an X chromosome and one …showed first 75 words of 1033 total…

…showed last 75 words of 1033 total…fish. The first are synchronous hermaphrodites. These have ovaries and testes at the same time. Fish in this group form spawning pairs. Each fish takes turns spawning the other fish from the pair’s eggs. The second are protogynous hermaphrodites. These fish are females at the start of their lives but later become males. The third group is protandrous hermaphrodites. These fish are males first, and then become females at the end of their lives.