Question

Which is NOT an example of a quantitative trait governed by several different genes and resulting in a continuum of phenotypes? Skin color in humans where homozygotes have either darker or lighter skins than individuals who are heterozygous for any of the group of genes. Milk production in cows where moderate produces will be homozygous for at least two of the genes responsible. Rose color where a cross between two heterozygotes produces 25 % of white offspring. Pod texture and plant height in a dihybrid cross of peas resulting in 1/16 of the offspring having constricted pods and dwarf stems. Egg number of chicken clutches where the lowest producers are homozygous for multiple ese laying genes.

Answer 1

QUANTITATIVE TRAIT : Quantitative trait is a measurable phenotype that is governed by number of different genes and resulting in a continuum of phenotype (i.e.,the expression of the genes in a continuous range of variation).

QUALITATIVE TRAIT : Qualitative trait is a non-measurable trait that is governed by one or a small group of genes. It is basically recognized by not having continuum of phenotype and characterized by all or none phenomenon (i.e., the phenotype is present or absent there is no in between).

Skin color in Humans, Milk production in cows, Rose color, plant height of Pea and Egg number of chicken clutches are quantitative traits as they are measurable phenotypes.

Pod texture of Pea is a Qualitative trait and Plant height of Pea is a non-continuum phenotype.

The plant height is either small or large as explained by Mendel.

So the correct answer would be "Pod texture and plant height in a dihybrid cross of peas resulting in 1/16 of the offspring having contricted pods and dwarf stems".