Sex Determination (OCR GCSE Biology A, Combined (Gateway Science Suite)): Flashcards
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12 cards from this deck
No. of chromosome pairs in human body cells
No. of chromosome pairs in human body cells
23 pairs
How many chromosome pairs control characteristics?
How many chromosome pairs control characteristics?
22 pairs
Which pair carries sex determining genes?
Which pair carries sex determining genes?
23rd pair
Two types of sex chromosomes
Two types of sex chromosomes
X and Y chromosomes
Female sex chromosome composition
Female sex chromosome composition
Two X chromosomes (XX)
Male sex chromosome composition
Male sex chromosome composition
One X and one Y chromosome (XY)
What sex chromosome do females pass on in eggs?
What sex chromosome do females pass on in eggs?
X chromosomes only
What sex chromosomes can males pass on in sperm?
What sex chromosomes can males pass on in sperm?
X or Y chromosomes
How many sex chromosomes go into each gamete?
How many sex chromosomes go into each gamete?
One sex chromosome
Chance of child being male
Chance of child being male
50%
Chance of child being female
Chance of child being female
50%
Size of Y chromosomes compared to X chromosomes
Size of Y chromosomes compared to X chromosomes
Much smaller