FAQ: In A Large Family In Which All Of The Daughers Are Normal And Half Of The Sons Are Colorbline?


What is the genotype of a female with normal vision?

2. Any woman with normal vision could be XX or XX’. Since this woman has a colorblind son ( genotype X’Y), she has to be XX’ (a carrier).

When the mother is normal and the father is Colour blind the son will be?

If the father is normal, he has genotype XNY. If the mother is colour blind, she is homozygous recessive, with genotype XnXn. Thus, all male children will inherit the Y chromosome from the father and the recessive Xn allele ( colour blindness ) from the mother. Thus they will all be colour blind.

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Which is dominant normal vision or color blindness?

90% (0.9) of the X-bearing eggs carry the dominant allele for normal vision, and 10% (0.1) of the eggs carry the recessive allele for color blindness.

What is the probability that a normal vision woman who marries a man who is color blind will have a daughter who is color blind?

When a color blind father and a mother who carries the color blind gene have children, there is a 50% chance that their sons will be color blind. Their daughters, however, will have a 50% chance of being color blind and 100% chance of being carriers of the gene.

Why is it rare to find a girl that is color blind?

Color blindness isn’t common in females because there’s a low likelihood that a female will inherit both genes required for the condition. However, since only one gene is needed for red-green color blindness in males, it’s much more common.

What is the genotype of a woman who is not colorblind?

The genotype of a woman who is not colour blind is XCXc.

What will be the genotype of the father if his daughter is Colour blind?

Males that are X+Y have normal color vision, while XcY males are colorblind. To determine the inheritance of red-green colorblindness (or any other X-linked trait), the genotypes of the parents must be considered.

Can a color-blind daughter can have a normal mother?

A colour blind daughter therefore must have a father who is colour blind and a mother who is a carrier (who has also passed the colour blindness ‘gene’ to her daughter ). If her father is not colour blind, a ‘carrier’ daughter won’t be colour blind.

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Who carries the colorblind gene?

Males have 1 X chromosome and 1 Y chromosome, and females have 2 X chromosomes. The genes that can give you red-green color blindness are passed down on the X chromosome. Since it’s passed down on the X chromosome, red-green color blindness is more common in men.

Is Color Blind dominant or recessive?

Most commonly, color blindness is inherited as a recessive trait on the X chromosome. This is known in genetics as X-linked recessive inheritance. As a result, the condition tends to affect males more often than females (8% male, 0.5% female).

When a colorblind woman marries a normal man?

When a colour blind woman marries a normal visioned male, daughters will be carrier for this disease and all sons will be colour blind, this can be represented as follows: So, the correct answer is ‘All sons are colour blind, daughters carriers’.

What are the odds of color blindness?

Colour Blindness Colour ( color ) blindness ( colour vision deficiency, or CVD) affects approximately 1 in 12 men (8%) and 1 in 200 women in the world. In Britain this means that there are approximately 3 million colour blind people (about 4.5% of the entire population), most of whom are male.

How does a female become a carrier of a disorder?

Females may get the defective gene either from her mother’s defective X, or, if her father has the disorder, from her father. In either case, the girl will be a carrier and will probably pass the defect to her offspring.

What is the probability that this couple’s first son will be color blind?

Probability of having a color blind daughter is (1/2 x 1/2) or 1/4 or 25% (0.25) This is because both sex and colorblindness are involved in the solution. The probability that their first son is color blind is 50% (0.50).

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When a normal carrier woman is married to a Colour blind man the progeny would be?

Complete answer: When a cross between a color – blind man and a woman with normal sight who has no family history of color blindness is done then the progeny will have four children – two daughters and two sons.

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