For each of the following characteristics, indicate whether it would be consider
ID: 166936 • Letter: F
Question
For each of the following characteristics, indicate whether it would be considered:
Discontinuous or continuous
Monogenic or polygenic
Multifactorial
Briefly justify your answers.
a. 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 strain: white, light red, and medium red.
b. 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 13 kg).
c. Presence or absence of leprosy. b // Susceptibility to leprosy is determined by multiple genes and numerous environmental factors.
d. Number of fingers in humans. Having six fingers is caused by the presence of an autosomal allele that is completely dominant.
e. Skin color in humans.
f. Height in humans
Explanation / Answer
a. 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 strain: white, light red, and medium red.
Answer: This would be considered discontinuous. Explanation: In this case the number of distinct phenotypes is less and kernel color is determined by alleles at single locus
b. 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 13 kg).
Answer: This would be considered discontinuous. Explanation: In this case also the number of phenotypes is less and its a single locus
c. Presence or absence of leprosy. b // Susceptibility to leprosy is determined by multiple genes and numerous environmental factors.
Answer: This would be considered continuous. Explanation: In this case since the susceptibility to leprosy is determined by multiple genes and is significantly affected by numerous environmental factors and it is therefore a continuous trait.
d. Number of fingers in humans. Having six fingers is caused by the presence of an autosomal allele that is completely dominant.
Answer: This would be considered discontinuous. Explanation: In this case the number of phenotypes is less and number of fingers is determined by alleles at a single locus (controlled by alleles of a single gene)
e. Skin color in humans.
Answer: This would be considered as a polygenic characteristic since it is controlled by several interacting genes and is influenced by environmental factors.
f. Height in humans
Answer: This would be also be considered as a polygenic characteristic since it is controlled by several interacting genes.
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