Inheritance of sex & sex linkage (Edexcel GCSE Biology Combined Science): Flashcards
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How many chromosome pairs in human body cells?
How many chromosome pairs in human body cells?
23 pairs
Which pair carries sex determining genes?
Which pair carries sex determining genes?
23rd pair
Chromosome combination in males
Chromosome combination in males
XY
Chromosome combination in females
Chromosome combination in females
XX
How much genetic info in gametes vs parent?
How much genetic info in gametes vs parent?
Half (1/2)
Parent whose gametes all contain X chromosomes
Parent whose gametes all contain X chromosomes
Mother
Chance of child being male
Chance of child being male
50%
Why sex-linked disorders more common in men
Why sex-linked disorders more common in men
Only one X chromosome - recessive alleles expressed (no second X to mask them)
Woman with one copy of recessive allele (not affected)
Woman with one copy of recessive allele (not affected)
Carrier
Disease where blood doesn't clot properly
Disease where blood doesn't clot properly
Haemophilia