AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

THE HUMAN GENOME

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A boy who is colorblind inherited the disorder from his
A
Mother
B
Father
C
Either Parent
D
None of the above
Explanation: 

Detailed explanation-1: -Since it’s passed down on the X chromosome, red-green color blindness is more common in men. This is because: Males have only 1 X chromosome, from their mother. If that X chromosome has the gene for red-green color blindness (instead of a normal X chromosome), they will have red-green color blindness.

Detailed explanation-2: -it’s usually passed on by a mother to her son – the mother will often be unaffected as she’ll normally just be a carrier of the genetic fault. fathers with a colour vision deficiency will not have children with the problem unless their partner is a carrier of the genetic fault.

Detailed explanation-3: -Colour blindness is one of the world’s most common genetic (inherited) conditions, which means it is usually passed down from your parents. Red/green colour blindness is passed from mother to son on the 23rd chromosome, which is known as the sex chromosome because it also determines your sex.

Detailed explanation-4: -Since boys have only one X chromosome, their chance of inheriting red-green color blindness is much greater. Boys always inherit their X chromosome from their mother.

Detailed explanation-5: -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).

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