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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
Expand the following biological abbreviations : DNA
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?
Choose the correct answer:
A colour blind woman marries a normal man, in the progeny _________
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.
How many daughters and how many sons have been born in the family?
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.
On which chromosome is the gene of this trait located?
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Colour blindness is a Y-linked character.
Long answer type question.
Explain cris-cross inheritance with suitable example.
Which of the following is also known as Bleeder's disease?
Four friends P, Q, R and S were discussing the examples of genetic disorders. The examples they quoted were as follows:
P. Colour blindness and Malaria
Q. Albinism and Cholera
R. Haemophilia and Colour blindness
S. Haemophilia and Albinism
Who gave the correct examples?
