sex chromosome inherited disease show cris cross inheritance analyse the statement
Answers
Sex chromosomes inherited diseases and criss cross inheritance:
• Genes for X chromosomes inherited diseases are present on non-homologous segment of X chromosome.
• Alleles of these genes do not present on Y chromosome.
• Genes of such characters are shifted from father to his daughter and from his daughter to her sons in F2 generation. This is recognized as Cris-cross inheritance.
• As the genes for most sex linked characters are present in X chromosome, they are named X-linked characters e.g., colour blindness and haemophilia in man and eye colour in Drosophila.
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Explanation:
- Sex chromosomes inherited diseases are seen in the non-homologous statement of the X chromosome. They are absent in the Y chromosome. Genes are inherited from father to his daughter and forwarded to her son or daughter and so on.
- These phenomena is known as cris-cross inheritance. Since most of the genes are present in the X linked chromosome, they are known as X linked characters. Examples are hemophilia and color blindness.
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