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

Solution

In birds, sex determination is of ZW – ZZ type.

In this type, the males are homogametic and have ZZ sex chromosomes, and females are heterogametic with ZW pair of sex chromosomes.

Parents:	Male	X	Female
	ZZ		ZW
Gametes:	(Z)(Z)		(Z)(W)
F1:	ZW		ZZ
	Female		Male

whereas, in human beings, the chromosomal mechanism of sex determination is of XX – XY type. The human male is heterogametic and has XY sex chromosomes and the human female is homogametic with XX sex chromosomes.

Some More Questions From Principles of Inheritance and Variation Chapter

Name the plant that shows incomplete dominance in respect of the colour of its flower.

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Principles Of Inheritance And Variation

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

Some More Questions From Principles of Inheritance and Variation Chapter

Name the plant that shows incomplete dominance in respect of the colour of its flower.

Write the genotypes of man with blood group A.

What is Mendel’s monohybrid phenotypic ratio ?

Write down Mendel’s dihybrid Phenotypic ratio

Who were the rediscoverers of Mendelism ?

What are the real determinants of what an organism will become ?

What is the unique feature of F1 generation ?

What will be the genetic make up of an organism which suffers from sickle cell anaemia ?

What do the symbols square and circle in a pedigree chart indicate ?

Define heterogamy. Give an example.

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