MCQ
Human skin colour is an example of:
- AIntragenic interaction
- BInterallelic interaction
- CQuantitative inheritance
- DPleiotropy
Explanation:
Inheritance of human skin colour is an example of polygenic inheritance. This character is determined by two or more pairs of genes and they have an additive effect. These genes are known as cumulative genes.
Here, more number of dominant alleles results in more expression of that character. Assume that three "dominant" capital letter genes (A, B and C) control dark pigmentation because more melanin is produced. The "recessive" alleles of these three genes (a, b & c) control light pigmentation because lower amounts of melanin are produced. Each "dominant" capital gene produces one unit of colour so that a wide range of intermediate skin colours are produced, depending on the number of "dominant" capital genes in the genotype.
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Statement $I:$ Gause's 'Competitive Exclusion Principle' states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually.
Statement $II:$ In general, carnivores are more adversely affected by competition than herbivores.
In the light of the above statements, choose the correct answer from the options given below: