JAMB - Biology (2006 - No. 13)
The two normal types of sex chromosomes are
XXY and XYY
XX and XYY
XY and XXY
XX and XY
Vysvětlení
The two normal types of sex chromosomes are the X chromosome and the Y chromosome.
- Females typically have two X chromosomes (XX) .
- Males typically have one X and one Y chromosome (XY) .