XY is a male while XX is female.
The sex chromosomes of a man are XY (vs. XX for a woman).
XY chromosomes SDT
If two fraternal twins have the XY sex chromosomes, they will be male.
About half of us DO have an XY chromosome. Males. XX chromosomes are female.
XY
xy
XY Chromosomes = Males XX Chromosomes = Females
Humans have 46 chromosomes, with 22 pairs of autosomes and 1 pair of sex chromosomes. Males have XY sex chromosomes while females have XX sex chromosomes. However, genetic disorders do occur whereby some males have XYY or XXY chromosomes, making the total number of chromosomes to be 47. Females have their own share of genetic disorders: Turner's Syndrome (single X chromosome) or Trisomy X (XXX). In normal cases the short answer would be: XY for males, XX for females.
XY in pair 23
XX for a girl and XY for a boy
what combination of sex chromosomes is shown in the image: XY (APEX)
Female have two X chromosomes while males have an X and a Y chromosome.