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  • Explain the mechanism of ‘sex determination’ in birds. How does it differ from that of human beings ?         

Explain the mechanism of ‘sex determination’ in birds. How does it differ from that of human beings ? 

 

 

 

 
 
 
 
 

Answers (1)

In the case of birds, the total number of chromosome is the same in both males and females. But two different types of gametes in terms of the sex chromosomes, are produced by females, i.e., female heterogamety. In these organisms, the females have one Z and one W chromosome, whereas males have a pair of Z-chromosomes besides the autosomes. 

In human beings, XY type of sex determination is seen where both male and female have same number of chromosomes. Among the males an X-chromosome is present but its counterpart is distinctly smaller and called the Y-chromosome. Females, however, have a pair of X-chromosomes. Both males and females bear same number of autosomes. Hence, the males have autosomes plus XY, while female has autosomes plus XX. Since males produce two different types of gametes,  some gametes with X-chromosome and some with Y-chromosome, it is designated to be the example of male heterogamety. 

Posted by

Priyanka Kumari

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