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An egg's sex chromosome is always an X, so it is the sperm's sex chromosome that determines an individual's sex.
There are rare exceptions to this rule in which, for example, XX individuals develop as males or XY individuals develop as females.
A sex difference is a distinction of biological and/or physiological characteristics associated with either males or females of a species. Because they are afraid of betrayal, and animal is much more faithful than man.All male often want sex, and the animals never do not refuse.Sperm also have only one set of 23 chromosomes and are therefore haploid.When an egg and sperm fuse at fertilization, the two sets of chromosomes come together to form a unique "diploid" individual with 46 chromosomes.
These include, most conspicuously, male (vs female) gonads.