HEREDITY
CODOMINANCE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
each parent must be colorblind
|
|
|
each parent must have the dominant allele for colorblindness
|
|
|
each parent must have the recessive allele for colorblindness
|
|
|
her father must have normal vision
|
Detailed explanation-1: -Females have 2 X chromosomes, one from their mother and one from their father. To have red-green color blindness, both X chromosomes would need to have the gene for red-green color blindness.
Detailed explanation-2: -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-3: -The version of the gene that causes colorblindness is also recessive. What this means is that if you have one “good” copy of the gene and one “colorblind” copy, then you won’t be colorblind. This means that girls need to inherit two copies of the colorblindness gene to be colorblind–one from each parent.
Detailed explanation-4: -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).
Detailed explanation-5: -Mutations in the OPN1LW, OPN1MW, and OPN1SW genes cause the forms of color vision deficiency described above. The proteins produced from these genes play essential roles in color vision. They are found in the retina, which is the light-sensitive tissue at the back of the eye .