Question

Question 1 0/4 pts Which of the following characteristics would be considered a quantitative traits? Select all that apply. Number of toes in guinea pigs, which is influenced by genes at many loci. Body weight in a family of Labrador retrievers. An autosomal recessive allele that causes dwarfism is present in this family. Two phenotypes are recognized: dwarf (less than 13 kg) and normal (greater than 23 kg). Presence or absence of leprosy. Susceptibility to leprosy is determined by multiple genes and numerous environmental factors Number of fingers in humans. Extra (more than five) fingers are caused by the presence of an autosomal dominant allele. Kernel color in a strain of wheat, in which two codominant alleles segregating at a single locus determine the color. Thus, there are three phenotypes present in this strains white, light red, and medium red.

Answer 1

A quantitative trait is a measurable phenotype that depends on the cumulative actions of many genes and the environment. These traits can vary among individuals, over a range, to produce a continuous distribution of phenotypes. Examples include height, weight and blood pressure. Finger development is a part of genetics that involve genes. In contrast, a qualitative trait is a trait that can be described as a category. For example, black or red coat color, horned or polled, coat color dilution are all qualitative traits.Qualitative traits are frequently controlled by one or just a few genes meaning they are simply-inherited traits.

So, by the above explaination, option a) b) c) and d) are quantitative traits.

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