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ICE Princess25 [194]
3 years ago
14

6. A biologist hypothesizes that restricting food from mice will decrease their activity. He designs an experiment in which he o

bserves the activity of 50 mice under restricted food regimens. Which of he following is true about his study?
A. The study is well designed since it uses a large sample of mice.
B. The study does not include a control group.
C. The study includes too many variables.
D. The results will allot the biologist to draw a valid conclusion.
Biology
2 answers:
Maksim231197 [3]3 years ago
8 0
<span>C. The study includes too many variables. </span>
aleksandr82 [10.1K]3 years ago
4 0

Answer : Option B) The study does not include a control group.

Explanation : The experiment does not includes a control group in it, as the inclusion of control group would have been used as a benchmark to measure how the other tested results were. The biologist simply hypothesized that restricting food from mice will decrease their activity. And on the same he designed his experiment in which he observed the activity of 50 mice under restricted food regimens. And he lacked a comparison for the results, i.e the control group.

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The inheritance of eye color in Drosophila is controlled by genes on each of the fly's four chromosome pairs. One eye-color gene
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F1 Females  - all wild type

F1 Males  - all wild type

F2 Females  -  - all wild type

F2 Males - 1/2 wild type, 1/2 vermilion

Explanation:

The wild-type allele (Xᵛ⁺) is dominant over vermilion (Xᵛ), which is a sex-linked trait.

Female flies have two X chromosomes, male flies have one X and one Y chromosome.

A homozygous wild-type female fly (Xᵛ⁺Xᵛ⁺) is mated with a vermilion male fly (XᵛY).

The female parent can only produce Xᵛ⁺ gametes.

The male parent can produce either Xᵛ or Y gametes.

When gametes from both parents fuse, the F1 offspring will have the genotypes Xᵛ⁺Xᵛ (females with wild type eyes) and Xᵛ⁺Y (males with wild type eyes).

The F1 females can produce Xᵛ⁺ and Xᵛ gametes. The F1 males can produce Xᵛ⁺ and Y gametes.

When the F1 individuals interbreed, the gametes combine to give rise to the F2 offspring. The possible combination of gametes that will give the different genotypes and phenotypes in the F2 are:

  • Xᵛ⁺Xᵛ⁺ females with wild type eyes
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  • Xᵛ Y males with vermilion eyes

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