Sex linkage in fruit flies

NCBI Bookshelf. An Introduction to Genetic Analysis. New York: W. Freeman; Most animals and many plants show sexual dimorphism ; in other words, an individual can be either male or female. In most of these cases, sex is determined by special sex chromosomes.
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Sex linkage in Drosophila

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Reading: Sex-Linked Traits | Biology I

A gene present on one of the sex chromosomes X or Y in mammals is a sex-linked trait because its expression depends on the sex of the individual. In humans, as well as in many other animals and some plants, the sex of the individual is determined by sex chromosomes. However, there are other sex determination systems in nature. For example, temperature-dependent sex determination is relatively common, and there are many other types of environmental sex determination.
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Sex linkage

This page has been archived and is no longer updated. One day in , American geneticist Thomas Hunt Morgan peered through a hand lens at a male fruit fly, and he noticed it didn't look right. Instead of having the normally brilliant red eyes of wild-type Drosophila melanogaster , this fly had white eyes. Morgan was particularly interested in how traits were inherited and distributed in developing organisms, and he wondered what caused this fly's eyes to deviate from the norm.
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Sex linkage is the patterns of inheritance and presentation when a gene mutation allele is present on a sex chromosome allosome rather than a non-sex chromosome autosome. They are characteristically different from the autosomal forms of dominance and recessiveness as they are different depending on the sex of the individual. Since humans have several times as many genes on the female X chromosome than on the male Y chromosome , X-linked traits are much more common than Y-linked traits. Additionally, there are more X-linked recessive conditions than X-linked dominant , and X-linked recessive conditions affect males much more commonly, due to males only having the one X chromosome required for the condition to present. In humans , X-linked traits are inherited from a carrier or affected mother or from an affected father.
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