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प्रश्न
उत्तर
Cause of Haemophilia - Haemophilia is an X-linked inherited disease. Homozygosity for recessive haemophilia gene is must to be seen in a female while a single affected X chromosome makes the male a haemophilia victim.
Cause of Colour Blindness - Colour blindness is the effect of a recessive gene. In case of female, both the X chromosomes must have the recessive gene but as males have only one X chromosome, just a single affected chromosome causes colour blindness.
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संबंधित प्रश्न
Give one example A nitrogenous base in DNA
Give technical terms for A sudden heritable change in the gene
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 |
A family consists of two parents and their five children and the pedigree chart shown below shows the inheritance of the trait colour blindness in them.
Name one other trait in humans which follows a similar pattern of inheritance.
A haemophilic man marries a carrier women. Find out the probability of their offsprings being haemophilic.
Give Technical Term:
Name a genetic disease in which a person cannot distinguish red and green colour.
Give examples of X-linked traits.
Which of the following is NOT an autosomal-linked recessive disease?
Holandric genes are located ______.
