Sexlinkd Disease

Question 1

What causes red-green color blindness?

Answer 1

A mutation in a gene on the X chromosome responsible for producing pigments needed to distinguish red and green colors

Question 2

Why do sex-linked diseases like red-green color blindness affect males more often?

Answer 2

Males have only one X chromosome (XY), so a defective gene on the X chromosome causes the condition. Females have two X chromosomes (XX), so they are less likely to express the condition unless both copies are defective

Question 3

What is the inheritance pattern for red-green color blindness in males?

Answer 3

Males inherit the X chromosome from their mother. If it carries the defective gene, they will be colorblind.

Question 4

What is the inheritance pattern for red-green color blindness in females

Answer 4

: Females must inherit defective alleles from both parents to express the condition. Otherwise, they can be carriers if they inherit only one defective allele.

Question 5

What happens when a colorblind father has children?

Answer 5

: He cannot pass the condition to his sons (who inherit his Y chromosome), but all his daughters will inherit the defective X chromosome and may become carriers.

Question 6

What is the chance of a carrier mother passing the defective X chromosome to her children?

Answer 6

: 50% chance to pass it to her sons (who may become colorblind) or daughters (who may become carriers).

Question 7

Q: What does X^Crepresent in genetic diagrams for red-green color blindness?

Answer 7

represents the allele for normal vision.

Question 8

Xc

Answer 8

Allen’s for red green colour blind ness