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6 Cards in this Set

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When does crossing over occur?
When homologous chromosomes pair up during Prophase I
Sex-linkage
- affected makes will pass the gene to ALL daughters
- sex-linked recessive affect only males; cannot be passed from father to son, but skip a generation (father to grandson) bia a daugher who is a carrier
Nondisjunction
Failure of homologous chromosomes to separate during meiosis I or II
XXY
sterile males
XXX
infertile females
XYY
normal males, but taller than afferage