2. Suggest three reasons why females have a longer life expectancy
Answers
Answer:
Extra X chromosome helps women live longer
Another biological reason for women’s longer life expectancy lies in their extra X chromosome.
While men have one X and one Y chromosome, women have two X chromosomes. The X chromosome contains microRNAs that are important in regulating the body’s immune system.
Since women have two X chromosomes, even if there is genetic mutation in one X chromosome, they have a backup copy to compensate. Men do not have this benefit. Any genetic mutations in the X chromosome in males can seriously impair their immunity against sex-linked disorders such as haemophilia and muscular dystrophy.
Physiologically, the one last advantage women hold over men is their better ability to fight infections. “Women tend to experience fewer bacterial and viral infections than men during their lifetime,” says Dr Mamun.