Inheritance of Human Skin Colour

Q. How many phenotypes are possible of the human ABO blood group ?

Q.

Melanin is the pigment that gives color to skin, hair and eyes. True or false?

1. True

2. False

Q.

Consider three genes $\frac{A}{a},\frac{B}{b}and\frac{C}{c}$ responsible for skin color inheritance. Then the phenotypes of persons with genotypes AABBCC and aabbcc respectively would be

1. Very dark and moderate dark

2. Very dark and very fair

3. Very fair and very dark

4. Moderate dark and moderate fair

Q. In a population of $400$ individuals, the frequency of a recessive allele is $40$. Find out which of these represents the total number of individuals with dominant phenotype?

1. $144$
2. $192$
3. $256$
4. $336$

Q.

Melanin is the pigment that gives color to skin, hair and eyes. True or false?

1. True

2. False

Q. Photosensitive pigment is

1. Similar in all eyes
2. Variable in all vertebrate eyes
3. Similar in all vertebrate eyes
4. Variable in all eyes

Q. Define dominance and co-dominance.

Q. Organisms phenotypically similar but genotypically different are due to

1. Heterozygosity
2. Monozygosity
3. Multizygosity
4. Homozygosity

Q.

Consider three genes $\frac{A}{a},\frac{B}{b}and\frac{C}{c}$ responsible for skin color inheritance. Then the phenotypes of persons with genotypes AABBCC and aabbcc respectively would be

1. Very dark and moderate dark

2. Very dark and very fair

3. Very fair and very dark

4. Moderate dark and moderate fair