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- https://bio.libretexts.org/Courses/Gettysburg_College/01%3A_Ecology_for_All/12%3A_Sex_Strategies/12.02%3A_Sex_determination_and_sex_ratiosIn both XY and ZW sex determination systems, the sex chromosome carrying the critical factors is often significantly smaller, carrying little more than the genes necessary for triggering the developme...In both XY and ZW sex determination systems, the sex chromosome carrying the critical factors is often significantly smaller, carrying little more than the genes necessary for triggering the development of a given sex. Other unusual systems include those of the green swordtail (a polyfactorial system with the sex-determining genes on several chromosomes) [13] ; the juvenile hermaphroditism of zebrafish, with an unknown trigger; [13] and the platyfish, which has W, X, and Y chromosomes.
- https://bio.libretexts.org/Bookshelves/Genetics/Classical_Genetics_(Khan_Academy)/03%3A_Sex_linkage/3.04%3A_Sex_linkage_reviewIf a female cat is heterozygous for black and tan alleles of a coat color gene found on the X, two Xs (and thus, the two alleles of the coat color gene) will be inactivated at random in different cell...If a female cat is heterozygous for black and tan alleles of a coat color gene found on the X, two Xs (and thus, the two alleles of the coat color gene) will be inactivated at random in different cells during development. In X-inactivation, females express only one X chromosome in each cell, meaning that genes on the X chromosome are expressed singly instead of in a pair.
- https://bio.libretexts.org/Workbench/General_Ecology_Ecology/Chapter_12%3A_Sex_Strategies/12.2%3A_Sex_determination_and_sex_ratiosIn both XY and ZW sex determination systems, the sex chromosome carrying the critical factors is often significantly smaller, carrying little more than the genes necessary for triggering the developme...In both XY and ZW sex determination systems, the sex chromosome carrying the critical factors is often significantly smaller, carrying little more than the genes necessary for triggering the development of a given sex. Other unusual systems include those of the green swordtail (a polyfactorial system with the sex-determining genes on several chromosomes) [13] ; the juvenile hermaphroditism of zebrafish, with an unknown trigger; [13] and the platyfish, which has W, X, and Y chromosomes.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Principles_of_Biology/02%3A_Chapter_2/19%3A_Genetics_-_Dog_Coat_Color/19.09%3A_Hemophilia_-_a_sex-linked_disorderAlthough the Y chromosome contains a small region of similarity to the X chromosome so that they can pair during meiosis, the Y chromosome is much shorter and contains fewer genes. This arrangement me...Although the Y chromosome contains a small region of similarity to the X chromosome so that they can pair during meiosis, the Y chromosome is much shorter and contains fewer genes. This arrangement means that during fertilization, it is the male that determines the sex of the offspring since the female can only give an X chromosome to the offspring. Sex is determined by the SRY gene, which is located on the Y chromosome and is responsible for the development of a fetus into a male.
- https://bio.libretexts.org/Bookshelves/Genetics/Classical_Genetics_(Khan_Academy)/03%3A_Sex_linkage/3.02%3A_X-linked_inheritanceChromosomal basis of sex determination. X and Y chromosomes, X-linkage.
