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Question
Explain the inheritance of sex-linked characters in human being.
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Solution
Haemophilia is commonly known as bleeder’s disease, which is more common in men than women. This hereditary disease was first reported by John Cotto in 1803. Haemophilia is caused by a recessive X-linked gene. A person with a recessive gene for haemophilia lacks a normal clotting substance (thromboplastin) in blood, hence minor injuries cause continuous bleeding, leading to death. The females are carriers of the disease and would transmit the disease to 50% of their sons even if the male parent is normal. Haemophilia follows the characteristic criss - cross pattern of inheritaitce.
RELATED QUESTIONS
Two pairs (A & B) of rabbits were crossed, as given below:
- Can you tell which coat colour (black or white) is dominant?
- Is the coat colour sex-linked?
Identify the ODD term in each set and name the CATEGORY to which the remaining three belong :
Example : glucose, starch, cellulose, calcium
Odd term : calcium
Category : others are different types of carbohydrates
Chicken pox, Colour blindness, Haemophilia, Albinism
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.
What does the child 1 indicate about this trait?
Give Reason:
Hemophilia shows criss-cross inheritance.
What are X-linked genes?
What is criss-cross inheritance?
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?
Identify the progeny produced if a colour blind male marries a normal vision female.
Night blindness is classified as which type of inheritance pattern?
Where are Y-linked genes located, and what is their inheritance pattern?
