Human sex is determined by sex chromosomes (XX for females, XY for males), and sex-linked traits are carried on these chromosomes. Males are more likely to express recessive X-linked traits, such as hemophilia, because they only have one X chromosome.
Humans have 23 pairs of chromosomes, with the 23rd pair (sex chromosomes) determining sex: XX for females and XY for males. Sex-linked characteristics are determined by genes on sex chromosomes; since the Y chromosome is smaller, males have only one X-chromosome allele, making them more susceptible to recessive X-linked traits like hemophilia, which causes slow blood clotting. Females can be carriers if they are heterozygous for the recessive allele.
Front | Determining sex - chromosomes, sex-linked chromosomes, and exaple of sex-linked genetic dissorder |
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