All of the following are continuously varying traits except?
Correct answer: D. Tongue rolling in humans
- A. Kernel colour in wheat
- B. Skin colour in humans
- C. Height in humans
- D. Tongue rolling in humans
Explanation
Option A: Kernel colour in wheat is a continuously varying trait because it can vary between different shades of yellow, brown, and red. Option B: Skin colour in humans is a continuously varying trait because it can vary from very light to very dark, depending on the amount of melanin in the skin. Option C: Height in humans is a continuously varying trait because it can vary from very short to very tall, and it is controlled by multiple genes and environmental factors.Option D: Quantitative traits are also called continuous traits, and they stand in contrast to qualitative, or discontinuous traits that are expressed in the form of distinct phenotypes chosen from a discrete set. Continuous variation in the expression of a trait can be due to both genetic and non-genetic factors. Continuous traits are common in humans, who show a wide range of possibilities in characteristics such as height, skin colour, learning ability, and blood pressure.
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Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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