You are asked to cross a pure breeding white-eyed female with a pure breeding red-eyed male. What are the genotypes of the individuals involved in this cross? XRXR XRXr XRX- XrXr XRY XrY
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If you continue with biological studies in the future, you are most likely going to carry out fruit fly experiments. Drosophila melanogaster are used in genetics labs due to how inexpensive they are, how visible their traits are, and their high reproductive rate.
In Drosophila, the gene for red and white eye colour is found on the X chromosome. The allele for red eyes (XR) is dominant to the allele for white eyes (Xr).
You are asked to cross a pure breeding white-eyed female with a pure breeding red-eyed male.
What are the genotypes of the individuals involved in this cross?
- XRXR
- XRXr
- XRX-
- XrXr
- XRY
- XrY
| Genotype of the parent male | Answer |
| Genotype of the parent female | Answer |
| Genotype of the male offspring | Answer |
| Genotype of the female offspring | Answer |
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- You are working in the lab with strains of Drosophila that have either normal legs or abnormally short legs and you are studying the gene responsible. You know that normal legs are dominant to short legs. You come across a misplaced fly with normal legs, but you are not sure of his genetic background and you want to keep him in your experiments. (Without doing a molecular analysis), How could you figure out whether he was heterozygous or homozygous for the leg gene that you are studying? (Describe what you would do and how the results would answer the question.) What is the procedure you described above called?You are doing a genetics experiment with the fruit fly. In the “P” generation, you cross two true-breeding flies. The female parent is brown and wingless and the male parent is black with normal wings. All of the flies in the F1 generation are brown and have normal wings. Answer all the questions below. 3a. What is the genotypes of P generation? 3b. What is the genotype of the F1 generation? 3c. You now take an F1 female and cross her to a true-breeding black, wingless male so what is the male’s genotype? 3d. You count 1600 offspring in the F2 generation. If the wing and the color traits were linked and no recombination occurred, what would you expect the numbers of: 1. brown winged flies (BbNn) 2. black winged flies (Bbnn) 3. brown wingless flies (bbNn) 4. black wingless flies (bbnn). 3e. What is the genetic distance between the color and wing genes when you count the F2 generation as 85 brown winged flies, 728 black winged flies, 712 brown wingless flies, and 75 black wingless flies.From your research, you discover that in this species of fish, the allele for black color is dominant to orange color. Based on this research, can you determine the genotype of a black fish just by looking at it? Why or why not? Yes, because the recessive allele must have been eliminated by the dominant one. Yes, because the phenotype always expresses all the alleles. No, because you do not know the DNA sequence. No, because it could be either homozygous dominant or heterozygous.
- An experiment is conducted on the eggs of purple-feathered barn swallows. A clutch of eggs from this nest is separated into two halves. One half of the eggs are left with the purple-feathered parents, and the other half of the eggs are moved to a nest built by gray-feathered barn swallows. Genetic analysis has shown that barn swallows have genes coding for feather color. Upon maturity, all barn swallows left with the original parents have purple feathers, while those that were transplanted have gray feathers. This experiment is repeated with a large number of other nests with similar results. What explains the results of this experiment? A:Color in barn swallows appears to follow a pattern of codominance. B:Genes in the transplant parents appear to influence feather color in barn swallows. C:Genes appear to have no influence on color pattern in barn swallows. D:Color in barn swallows appears to be influenced by both genes and the environment.Imagine you are working in a genetics lab with the fruit fly Drosophila melanogaster, a model organism for genetics research. You want to determine whether a trait you have discovered in fruit flies is dominant or recessive.• Explain how you would design an experiment to answer this question.• Predict what types of outcomes are possible. Which would indicate that the trait is dominant? Which would indicate that it is recessive?in a summary use your understanding of molecular biology to explain that recessive alleles are expressed through transcription and translation, and that they may have functional gene products. Describe how the interaction of the products produced by each allele results in what we see as dominant or recessive traits.
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