Question

What are sex chromosomes? Which sex chromosomes are found in male and female human beings? State the chromosomes responsible for the development of the male child in human beings.
(b) Explain whether the traits like eye colour or height is genetically inherited or not. Do power to lift weight and reading french also belong to the same category? Justify your answer.

Answer 1

• Chromosomes which are involved in the determination of sex in the organisms are known as Sex chromosomes.
  
• In human beings sex chromosomes are different in males from females.
  

In males, sex chromosomes are known as mismatched pairs because they have one normal size called X and other is short in size called a Y chromosome.

• In females, sex chromosomes are perfect pairs because have two X chromosomes which are identical to each other.
  
• The Y chromosome is responsible for the development of the male child in human beings.
• Yes, traits like eye colour or height are genetically inherited because they can be passed on from one generation to the next (Inherited characters). No, the power to lift and reading French does not belong to the same category as it cannot be passed on from one generation to the next (as they are acquired characters).