Hereditary determination of sex
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 …
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…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.
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