Question

Distinguish between X andY chromosomes. (Mention any 'two' points.) 

Answer 1

No	X Chromosome	Y chromosome
1	These chromosomes are metacentric, hence appear X shaped.	These chromosomes are acrocentric, hence appear Y shaped
2	They are longer than ‘Y’ chromosomes	They are shorter than ‘X’ chromosomes
3	It contains large amount of euchromatin and small amount of heterochromatin.	It contains large amount of heterochromatin and small amount of euchromatin.
4	Found in both male and females.	Found only in males.
5	Non-homologous part shows more genes than Y chromosome.	Non-homologous part contains few genes as compared to X chromosome.
6	X - linked genes are present on X chromosome.	Y- linked genes (Holandric genes) are present on Y chromosome.
7	Genes present on X chromosome show criss-cross inheritance.	Genes present on Y chromosome show straight inheritance