X-Linked and Y-Linked Inheritance - Introduction скачать в хорошем качестве

X-Linked and Y-Linked Inheritance - Introduction

Although the anatomical and physical differences between women and men are numerous, the chromosomal basis for determining sex is rather simple. A clear picture of the genetic basis of sex determination emerged after the discovery of the sex chromosome. in this video, we are going to discuss the difference between X-linked and Y-linked Inheritance, X-linked Diseases, and examples of Y-linked inheritance. ▬ X-Linked and Y-Linked Inheritance ▬▬▬▬▬▬▬▬▬▬ There is a wide variety of sex-determining mechanisms, but three patterns are more common: 👉 XY-XX Type 👉 XO-XX Type 👉 WZ-ZZ Type ▬ SRY Genes ▬▬▬▬▬▬▬▬▬▬ Y-chromosome has SRY genes called sex-determining region Y-gene. When this region in a gene is lacking from Y-chromosome the individual is female even though the chromosomal inheritance is XY. This gene is Y-linked because it is found only on the Y chromosome. ▬ Sex Linkage ▬▬▬▬▬▬▬▬▬▬ Traits controlled by alleles on the sex chromosomes are said to be sex-linked and the phenomenon is called sex linkage. ▬ Sex Linkage in Drosophila ▬▬▬▬▬▬▬▬▬▬ Morgan's Experiments on Eye Colour in Drosophila. First, Morgan crossed the white-eyed male to a red-eyed female. To know the details, watch our video on X-linked and Y-linked Inheritance. ▬ Sex Linkage in Human ▬▬▬▬▬▬▬▬▬▬ Humans have many X-linked traits: 👉 X-Linked Dominant 👉 X-Linked Recessive ▬ Sex Linked Disorders in Human ▬▬▬▬▬▬▬▬▬▬ Humans have several disorders that are caused by the mutation in sex chromosomes as Drosophila has white eye color. The inheritance patterns of some sex liked disorders in humans are: 👉 Genetics of Colorblindness 👉 Genetics of Hemophilia ▬ Mutations in Opsin Genes ▬▬▬▬▬▬▬▬▬▬ Mutations in opsin genes cause color-blindness like: 👉 Dichromacy 👉 Monochromacy ▬ Sex Related Traits ▬▬▬▬▬▬▬▬▬▬ Sex-related traits are those which are associated with maleness or femaleness. These traits are not necessarily sex-linked. These traits may be controlled by sex-linked or autosomal genes. They are of two different types: ▪️Sex-limited traits. ▪️Sex Influenced traits. So, this was all about our video on X-linked and Y-linked Inheritance.