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Principles Of Inheritance And Variation

Question
CBSEENBI12000236
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How is sex determined in human beings?

Solution

Sex is determined by XY type in humans.
In humans 22 pairs of chromosomes called Autosomes are present and one pair of Sex chromosomes are present.
Males have  44+XY chromosomes and  they are heterozygous for sex chromosomes and produce two types of gamete one type is having 50% X-chromosome, whereas, other type is having Y-chromosome.
Female have 44+XX chromosomes and are homozygous and produce one type of  gamete having X chromosome.

Therfore if the child has XY chromosomes it is a boy and if it has XX chromosomes it is a girl.

Some More Questions From Principles of Inheritance and Variation Chapter

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.

How many chromosomes are found in human cells ?

Why is male Drosophila regarded as heterogametic ?

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