Sex chromosome - Wikipedia
An allosome (also referred to as a sex chromosome, heterotypical chromosome, heterochromosome, or idiochromosome) is a chromosome that differs from an ordinary autosome in form, size, and behavior. The human sex chromosomes, a typical pair of mammal allosomes, determine the sex of an individual created in sexual reproduction.Autosomes differ from allosomes because autosomes appear in pairs ...
Sex-determination system - Wikipedia
The XX/XY sex-determination system is the most familiar, as it is found in humans. The XX/XY system is found in most other mammals, as well as some insects.In this system, most females have two of the same kind of sex chromosome (XX), while most males have two distinct sex chromosomes (XY).
INTRODUCTION. Sex chromosome abnormalities are due to numeric abnormalities (eg, aneuploidies such as monosomy X) or structural defects (eg, isochromosome Xq leading to Turner syndrome) involving the X and Y chromosomes.
Klinefelter Syndrome Support Group website
DISCLAIMER The information, text, graphics, and links provided on this site are provided for those seeking information about Klinefelter Syndrome/XXY.
WHO | Gender and Genetics
Humans are born with 46 chromosomes in 23 pairs. The X and Y chromosomes determine a person’s sex. Most women are 46XX and most men are 46XY. Research suggests, however, that in a few births per thousand some individuals will be born with a single sex chromosome (45X or 45Y) (sex monosomies) and ...
The End of Men? Male Sex Chromosome Is Slowly Disappearing
This article was originally published on The Conversation. Read the original article. The Y chromosome may be a symbol of masculinity, but it is becoming increasingly clear that it is anything but ...
Basic Principles of Genetics: Glossary of Terms
alternate forms or varieties of a gene.The alleles for a trait occupy the same locus or position on homologous chromosomes and thus govern the same trait. However, because they are different, their action may result in different expressions of that trait.
性染色体 - Wikipedia
性染色体（せいせんしょくたい）とは、雌雄異体の生物で雌雄によって形態や数が異なる染色体もしくは形態的な差異が見られないが性決定に関与する染色体。 性染色体以外の雄 雌で共通な染色体は常染色体と呼ぶ。 性染色体と常染色体との区別は、動物だけではなく、一部の植物にもある 。
Stages of development of from a human ovum to a fetus
About 1 month before conception: Almost all adult males produce thousands of spermatozoa (a.k.a. gametes or male germ cells) each second.Through a process called "meiosis" the number of chromosomes in each spermatozoon produced is half the normal number found in human DNA: 23 instead of 46.
determinante - Diccionario Inglés-Español WordReference.com
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