Sunday, 17 November 2013

Sex cells

Male and female versions. Required for sexual reproduction"
Males - sperm
Female - eggs , ova
Sex cells contain half the number of chromosomes as a body cell has, so when 2 sex cells join together a complete set of genetic materiel is obtained.
In humans 23 chromosomes come from dad
23 chromosomes come from mum.

Sex of offspring is determined by the male
Female xx
Male xy

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