The XY sex-determination system is a sex-determination system present in many mammals, including humans, some insects , some snakes, some fish , and some plants (Ginkgo tree). In this system, the sex of an individual usually is determined by a pair of sex chromosomes .

2016年8月30日 · Medical students are taught that X and Y chromosomes have no impact on cells outside of the reproductive organs — that sex hormones are entirely responsible for making the body more masculine or feminine. But Dr. Page argues that there are differences between XX and XY cells that affect tissues and organs across the entire body.

Sex chromosomes are chromosomes, or packages of DNA, that are found inside the nucleus of all of your cells. There are two different kinds: X and Y, which determine whether you’re...

5 天之前 · sex chromosome, either of a pair of chromosomes that determine whether an individual is male or female. The sex chromosomes of human beings and other mammals are designated by scientists as X and Y. In humans the sex chromosomes consist of one pair of the total of 23 pairs of chromosomes. The other 22 pairs of chromosomes are called autosomes.

2023年12月14日 · 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...

Parental imprints on X genes are inherently unequal in the two sexes, because XY cells can only express a maternal imprint on imprinted X genes, whereas XX cells can show the effects of a maternal or paternal X imprint depending on which X chromosome is active in a specific cell.

2020年10月26日 · Some people have differing sex chromosomes, such as those who are born with an extra X chromosome (XXY) or who are missing an X chromosome (XO). Or, some people with XX or XY chromosomes might have physical characteristics that don’t seem to align with what’s typically expected of their DNA.

2023年12月13日，Whitehead研究所的研究人员在 Cell 子刊 Cell Genomics 上发表了题为：The human Y and inactive X chromosomes similarly modulate autosomal gene expression 的研究论文。 该研究表明，人类的性染色体不仅仅是决定性别，而是对全身细胞有着广泛影响。

2023年12月13日 · Through linear modeling of autosomal gene expression in cells from individuals with zero to three Xi and zero to four Y chromosomes, we found that Xi and Y impact autosomal expression broadly and with remarkably similar effects.

2004年5月15日 · What is the spermatocyte's XY body and how is it related to meiosis? Meiosis is a specialized cell division process, the defining event of gametogenesis. During the extended meiotic prophase in spermatocytes, homologous chromosomes pair …