Sex Determination (AQA GCSE Biology Combined Science): Flashcards
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Number of chromosome pairs in human body cells
Number of chromosome pairs in human body cells
23 pairs
Number of chromosome pairs controlling characteristics
Number of chromosome pairs controlling characteristics
22 pairs
What the 23rd chromosome pair carries
What the 23rd chromosome pair carries
Sex determining genes
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)
What females pass on in their eggs
What females pass on in their eggs
X chromosome only
Male sex chromosome composition
Male sex chromosome composition
One X and one Y chromosome (XY)
What males pass on in their sperm
What males pass on in their sperm
X or Y chromosome
Probability of child being male
Probability of child being male
50%
Probability of child being female
Probability of child being female
50%