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In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively.
Men with XX chromosomes. XX male syndrome, or de la Chapelle syndrome, is a very rare condition where a baby with two XX chromosomes is born with a male appearance.
Typically, embryos with one X and one Y chromosome develop into males. And those with two X chromosomes usually become females. We get one sex chromosome from our fathers, carried by sperm, and one from our mothers, carried by the egg. The sperm and egg fuse during fertilization, which creates a zygote that can develop into a human.
Individuals having two X chromosomes (XX) are female; individuals having one X chromosome and one Y chromosome (XY) are male. The X chromosome resembles a large autosomal chromosome with a long and a short arm. The Y chromosome has one long arm and a very short second arm.
Sex chromosomes are chromosomes that affect your sexual anatomy and reproductive development. Most of us were raised with the idea that there are two sexes: male and female. We’re usually told...
Humans typically develop as either male or female, primarily depending on the combination of sex chromosomes that they inherit from their parents. The human sex chromosomes, called X and Y, are structures in human cells made up of tightly bound deoxyribonucleic acid, or DNA, and proteins.
In mammals, the sex chromosomes are called X and Y. Females have paired X chromosomes, one from each parent, while males have an X and a Y chromosome. Males get their single X chromosome only from their mothers and their Y chromosome only from their fathers.
In this system, females have two of the same kind of sex chromosome (XX), while males have two distinct sex chromosomes (XY). The X and Y sex chromosomes are different in shape and size from each other, unlike the rest of the chromosomes (autosomes), and are sometimes called allosomes.
Males, on the other hand, carry only one X chromosome (XO) and produce some gametes with X chromosomes and some gametes with no sex chromosomes at all (Figure 5).
Rapid advances in molecular biology have revealed the genetic and molecular bases of a number of sex-based differences in health and human disease, some of which are attributed to sexual genotype—XX in the female and XY in the male. Genes on the sex chromosomes can be expressed differently between males and females because of the presence of ...