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#3. For each of the following characteristics, indicate whether it would be considered a discontinuous characteristic or a quantitative characteristic. Briefly justify your 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. 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 23 kg). C. Presence or absence of leprosy. Susceptibility to leprosy is determined by multiple genes and numerous environmental factors. D. Number of toes in guinea pigs, which is influenced by genes at many loci. E. Number of fingers in humans. Extra (more than five) fingers are caused by the presence of an autosomal dominant allele.

          #3. For each of the following characteristics, indicate whether it would be considered a discontinuous
characteristic or a quantitative characteristic. Briefly justify your 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.
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 23 kg).
C. Presence or absence of leprosy. Susceptibility to leprosy is determined by multiple genes and numerous
environmental factors.
D. Number of toes in guinea pigs, which is influenced by genes at many loci.
E. Number of fingers in humans. Extra (more than five) fingers are caused by the presence of an
autosomal dominant allele.

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#3. For each of the following characteristics, indicate whether it would be considered a discontinuous
characteristic or a quantitative characteristic. Briefly justify your 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.
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 23 kg).
C. Presence or absence of leprosy. Susceptibility to leprosy is determined by multiple genes and numerous
environmental factors.
D. Number of toes in guinea pigs, which is influenced by genes at many loci.
E. Number of fingers in humans. Extra (more than five) fingers are caused by the presence of an
autosomal dominant allele.

Added by Nicholas L.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

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Solved by Expert Adi S

08/30/2023

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This is a discontinuous characteristic because there are distinct categories with no intermediate forms. $$\textbf{Discontinuous}$$ Show more…

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#3. For each of the following characteristics, indicate whether it would be considered a discontinuous characteristic or a quantitative characteristic. Briefly justify your 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. 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 23 kg). C. Presence or absence of leprosy. Susceptibility to leprosy is determined by multiple genes and numerous environmental factors. D. Number of toes in guinea pigs, which is influenced by genes at many loci. E. Number of fingers in humans. Extra (more than five) fingers are caused by the presence of an autosomal dominant allele.

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Transcript

00:01 The first characteristic that we have been given is kernel color in wheat.

00:11 Okay, so this is a discontinuous characteristic.

00:22 So you know for kernel color in wheat there are three phenotypes, three distinct phenotypes white, light red and medium red.

00:30 So you know what will be the exact color of the kernel is determined by the presence of two co -dominant alleles, okay, which is present at a single locus.

00:41 So this you know these categories they indicate a distinct or a you know a discrete or a categorical trait.

00:49 So that is why it's a discontinuous characteristic.

00:52 The next characteristic is body weight in labrador retrievers.

01:00 Okay, so this is also a discontinuous characteristic.

01:13 So labradors you know they should in according to the question they have two distinct phenotypes.

01:19 Okay, one which is you know the dwarf phenotype is less than 13 kgs and the normal phenotype is greater than 23 kgs.

01:26 So the presence of an you know autosomal recessive allele that causes dwarfism.

01:33 Okay, and thus there is you know like a clear division between the two phenotypes.

01:37 So that is why it's a discontinuous characteristic.

01:39 The third one is a you know presence or absence of leprosy.

01:50 So this is also a discontinuous characteristic.

02:01 Okay, so leprosy is a very discrete trait...

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