Bio1100
Chapter 31
Reproduction and Development
Some organisms exhibit
hermaphroditism
, where one individual contains both male and female
organs
.
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Sex in mammals is determined by the presence of the
SRY
gene on the
Y
chromosome
.
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Animals evolved in the
ocean
where
fertilization
usually occurs
externally
.
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Birds and mammals undergo
internal
fertilization
and are
homeotherms
.
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In human males,
sperm
is
produced
in the
testis
in a process called
spermatogenesis
.
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Female gametes
develop
in the
ovary
in a process called
oogenesis
.
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