strayer sci115 Genetics Lab Assessment

Question 1

3 out of 3 points

Correct

In the first part of this lab, we study data from a (hypothetical) species called Glyptodan neomexicanus. Each individual has either a red shell or a yellow shell. A count of individuals in a particular area indicates that there are 122 red individuals and 38 yellow individuals. If we assume that shell color is inherited in a Mendelian fashion, which shell color appears to be dominant?

Question 2

3 out of 3 points

Correct

All we can observe directly is the phenotype of an individual, without biochemical or genomic analysis. Therefore, we cannot ascertain the genotype of individuals by inspection of their shells. However, if shell color is inherited in a Mendelian fashion and if we study family units, we can infer the genotype from the phenotypes of the parents and the offspring. In this analysis we are assuming that red is dominant and yellow is recessive. The A allele goes with the red trait, the a allele goes with the yellow trait.

If one parent is red and the other is yellow and half the offspring are red, while half the offspring are yellow, then

Question 3

3 out of 3 points

Correct

All we can observe directly is the phenotype of an individual, without biochemical or genomic analysis. Therefore, we cannot ascertain the genotype of individuals by inspection of their shells. However, if shell color is inherited in a Mendelian fashion and if we study family units, we can infer the genotype from the phenotypes of the parents and the offspring. In this analysis we are assuming that red is dominant and yellow is recessive. The A allele goes with the red trait, the a allele goes with the yellow trait.

If both parents are red, and there are three red offspring and one yellow offspring, we know that:

Question 4

3 out of 3 points

Correct

Refer to the picture of the thin-layer chromatography results to answer this question. Is the grey pigment controlled by the same gene as the red pigment?

No

Question 5

3 out of 3 points

Correct

Refer to the picture of the thin-layer chromatography results to answer this question Which pigment is always present when a dominant allele ( A) is present?

Question 6

3 out of 3 points

Correct

Refer to the picture of the thin-layer chromatography results to answer this question Can you distinguish between the chromatograms of an Aa individual and an AA individual?

Question 7

3 out of 3 points

Correct

Electrophoresis Demo

How many proteins appear to be related to the differences in shell color?

Question 8

3 out of 3 points

Correct

Electrophoresis Demo

Since genes are expressed by coding for the production of individual proteins, do any proteins found appear to be under the control of any particular allele(s)?

Question 9

3 out of 3 points

Correct

Electrophoresis Demo

Does the presence or absence of a particular protein correlate with the presence or absence of a particular allele?

Question 10

3 out of 3 points

Correct

Electrophoresis Demo

What is the approximate molecular weight of the protein that is missing from the homozygous recessive extract?