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प्रश्न
Give scientific reasons : Colour blindness is more common in men than in women.
उत्तर
Colour blindness is an X-linked disorder caused by a recessive gene. Males have only one ‘X’ chromosome and thus have only one copy of the gene which if recessive may lead to colour blindness. However, females have two ‘X’ chromosomes and both should possess the recessive gene for her to become colourblind, which occurs rarely.
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संबंधित प्रश्न
Match the terms in column I with their explanations in column II.
| Column I (Term) | Column I (Explanation) | ||
| a | genetics | 1 | Chromosomes similar in size and shape |
| b | Autosomes | 2 | The alternative forms of a gene |
| c | Recessive gene | 3 | Study of laws of inheritance of characters |
| d | Allele | 4 | A gene that can express only when in a similar pair |
| e | Homologous chromosomes | 5 | Chromosomes other than the pair of sex chromosomes |
Answer the following briefly:
Explain with the help of a chart what will be the colour of a child's hair if father has got dominant gene for black hair and mother has recessive gene for brown hair?
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Haemophilia exhibits X linked inheritance.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Cancer is a genetic disorder.
Choose the Odd One Out
What are holandric genes?
Study the following statements and select the correct option.
Statement I: Holandric genes are present on Y chromosome. Statement II: Holandric genes are always inherited from father to son.
What is the probability of son being colour blind is if a colour blind man marries a woman who is homozygous for normal colour vision?
Which of the following is also known as Bleeder's disease?
