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Presentation transcript:

STARTER

Now try your non-disjunction review sheet!

Non dis-junction of sex chromosomes

Turner’s syndrome Gamete with no sex chromosomes fuses with normal X gamete Zygote has chromosome complement 2n = 45 Individuals are female and short in stature Infertile because ovaries haven’t developed normally

Klinefelter’s syndrome XX egg fertilised by normal Y sperm or Normal X egg is fertilised by an XY sperm Zygote has chromosome complement 2n = 47 (44 + XXY)

Always male Normally infertile Cannot produce sperm

Now try the non-disjunction review sheet