Males are less likely to survive than females,both before and after birth.One important reason is that

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This statement is a reference to the fact that males only have one X chromosome, while females have two. For males, the single X chromosome is all they have to work with, so if it contains a recessive X-linked allele, they will express it. Females, on the other hand, have two X chromosomes, so if they carry a recessive X-linked allele on one X chromosome, they may still have a functional copy on the other X chromosome. Therefore, males are more vulnerable to disorders caused by X-linked recessive alleles than females.

Males Are Less Likely to Survive Than Females,both Before and After