KCET · BIOLOGY · STD 12 - 4. Principles of Inheritance and Variation
Choose the possible genotype responsible for lightest skin colour in human beings.
- A AABBCC
- B AaBbCc
- C aabbcc
- D AABbCc
Answer & Solution
Correct Answer
(C) aabbcc
Step-by-step Solution
Detailed explanation
(C) aabbcc,
Three genes (six alleles) contribute to skin colour. The three genes are A, B, and C and their alleles are A and a, B and b, and C and c, where A, B and C contribute to dark skin colour and a, b and c contribute to light skin colour. For human skin colour, the alleles code for the production of the skin pigment melanin, and their effect is cumulative. This implies that a person with genotype AABBCC has six alleles that code for high production of melanin, and their effect is cumulative. This implies that a person with genotype AABBCC has six allels that code for high production of melanin, thus indicating that their skin would be very dark. On the other hand, a person with genotype aabbcc has six alleles that code for low production of melanin and thus their skin would be very light.
Three genes (six alleles) contribute to skin colour. The three genes are A, B, and C and their alleles are A and a, B and b, and C and c, where A, B and C contribute to dark skin colour and a, b and c contribute to light skin colour. For human skin colour, the alleles code for the production of the skin pigment melanin, and their effect is cumulative. This implies that a person with genotype AABBCC has six alleles that code for high production of melanin, and their effect is cumulative. This implies that a person with genotype AABBCC has six allels that code for high production of melanin, thus indicating that their skin would be very dark. On the other hand, a person with genotype aabbcc has six alleles that code for low production of melanin and thus their skin would be very light.
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