Y Chromosome and Male Development

Principles of Inheritance and Variation | Class 12 Biology | NEET Biology
Principles Of Inheritance And Variation | Class 12 Biology | Genetics
CBSE Class 12 Biology, Principles of Inheritance and Variation
TNSCERT Class 12 Bio Zoology Chapter 4 - Principles of Inheritance and Variation, CBSE | NCERT - Tamil

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** Pleiotropic genes (Pleiotropy) :    • Pleiotropic genes (Pleiotropy) | Gene...  
** Sex Determination :    • Sex Determination | Genetics (Class 12)  


Humans are XX-XY type. Out of 23 pairs of chromosomes present, 22 pairs are exactly the same in both males and females; these are the autosomes. A pair of X-chromosomes are present in the female, whereas the presence of an X and Y chromosome are determinant of the male
characters. Females are homogametic producing only one type of gametes (egg), while the males are heterogametic.
Current analysis of Y chromosomes has revealed numerous genes and regions with potential genetic function. Present at both ends of the Y chromosome are the pseudoautosomal regions (PARs).95% of the Y chromosome is referred to as the Non - combining Region of the Y (NRY). The NRY is divided
equally into functional genes (euchromatic) and non functional genes (heterochromatic).

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