A Punnett square for sex determination using the sex chromosomes. The female produces only one type of egg with respect to sex chromosomes. She is XX so, with respect to sex chromosomes, she is "homozygous".
Über ein XY/XX-System verfügen Säugetiere (und damit auch Menschen), jeweils einige Eidechsen, Amphibien und Fische, die Fruchtfliege Drosophila melanogaster sowie manche Pflanzen wie der Ampfer und einige Lichtnelken ().
What is the relationship between chromosomes and sex? Sex is determined by the presence or absence of certain chromosomes.
性決定（せいけってい、英語:sex determination）とは、雌雄が別の個体である生物において個体の性別が定まること 。 有性生殖を行う動物や植物などには、雌性および雄性の生殖器 …
Alex Quinn, a Ph.D. candidate at the Institute for Applied Ecology at the University of Canberra in Australia, sorts this quandary out for us. Sex-determining mechanisms in reptiles are broadly divided into two main categories: genotypic sex determination (GSD) and temperature-dependent sex
Chapter 28:01 LABOUR ACT Acts 16/1985, 12/1992, 20/1994 (s. 19), 22/2001, 17/2002. ARRANGEMENT OF SECTIONS PART I PRELIMINARY Section 1. Short title.
We work hard to answer queries and ensure your experience of The Independent is as good as we can possibly make it. On this page you can find out how to contact us.
Chromosomal basis of sex determination. X and Y chromosomes, X-linkage.
The ZW sex-determination system is found in birds, some reptiles, and some insects and other organisms. The ZW sex-determination system is reversed compared to the XY system: females have two different kinds of chromosomes (ZW), and males have two of the same kind of chromosomes (ZZ).
Birds and many insects have a similar system of sex determination (ZW sex-determination system), in which it is the females that are heterogametic (ZW), while males are homogametic (ZZ).