Sex chromosomes
Cards (10)
- phenotypes = physical features
- phenotypes result of a selection of genes combined -> NOT just one single gene (e.g. height = result of many genes being expressed)
- Male = XY
- female =XX
- Male gametes = X or Y (gametes only have half no chromosomes)
- Female gametes = only one X chromosome (gametes only have half no chromosomes)
- 50% chance that a baby is male/ female (NOT 50/50 as that = 1)
- on a punnett square (unless asked otherwise) female goes on top
- fertilised egg = 46 chromosomes
- gametes = 23 chromosomes