It all started when we found our first useful fruit fly mutation. Problem 1: Crossing a white-eyed female and red-eyed male fly In a cross between a white-eyed female fruit fly and red-eyed male, what percent of the female offspring will have white eyes? The genes are located on the same chromosome. These are the only traits tested. 100%. In fruit flies, red eyes (R) are a dominant trait and white eyes (r) are recessive. In fruit flies, eye color is a sex linked trait. As a recessive trait, the white eye phenotype is masked by the presence of a wild-type (red encoding) allele. a. autosomal (carried on an autosome); dominant b. autosomal; recessive In fruit flies, red eyes are dominant (E). the phenotype is the visible manifestation of a genotype. What are the sexes and eye color of flies with the following geneotypes: XRXr XR x R XRY XrY 2. In a generation of fruit flies, 45 males with white eyes, 46 females with white eyes, 44 males with red eyes, and 47 females with red eyes are produced. A heterozygous wild fruit fly is mated with a sepia-eyed, apterous fruit fly. 3. Leave a fruit out in the open for 5 days. Cross a homozygous, red-eyed female with a white-eyed male. (Hint: You many want to complete a Punnett square.) If the female fly has EE and the male fly has EE, what are the possible phenotypes and genotypes of their offspring? They exhibit sexual dimorphism; females are … (Hint: You many want to complete a Punnett square.) Click hereto get an answer to your question ️ In fruit flies, red eyes are dominant to green eyes. Yes. Example 1: In fruit flies, the gene for red eyes is dominant over the õene for white eyes. Show the cross of a white eyed female Xr Xr with a red-eyed male X R Y 4.Show a cross betwen a pure red eyed female and a white eyed male. Red eyes are dominant, and X-linked. Image Transcriptionclose. Use a Punnett Square to predict the percentage of offspring which will probably have red eyes and white eyes e Ee Ee LOW 3 7) A female fly has the EE genotype for eye color. The fruit flies in this exhibit show just a few of the mutations that occur in natural fruit fly populations. Step I : x R— Red Eyes X— White Eyes Phenotypic Ratio 2 red eved female red eyed male What are the geneotypes of these flies: white eyed, male white eyed, female red eyed female (heterozygous) red eyed, male 3. If a homozygous red eyed fly was crossed with a white eyed fly, what percent of the offspring would be homozygous recessive? If a red-eyed homozygous fly (RR) and a red-eyed heterozygous fly (Rr) mate together, what are the possible genotypes of their offspring? White eyes are recessive (e). The Punnet square below represents a cross between a heterozygous red-eyed female and a white-eyed male. b. Notice the antennas sticking out in front of their red eyes. Many of the important discoveries of genetics and chromosomal inheritance came out of my lab through research using fruit flies. But since its autosomal, its not on any of the sex chromosomes. (Hint: You many want to complete a Punnett square.) In fruit flies, red eyes (wild) is dominant to sepia (sp), and winged (wild) is dominant to apterous (ap). If a red-eyed homozygous fly (RR) and a red-eyed heterozygous fly (Rr) mate together, what are the possible genotypes of their offspring? The image shows a mutant double recessive fly (ggee). Which of the following is the best conclusion you can make In fruit flies, red eyes are dominant (E). Problem 5: Another white-eyed female x red-eyed male fly cross A white-eyed female fruit fly is crossed with a red-eyed male. The gene that controls whether eyes are red or ruby is _____ and the allele for ruby eyes is _____. After crossing between white-eyed female (XWXW) with red-eyed male (X+Y), in the F1 generation, all the females flies were red-eyed and all the male flies were white-eyed. Answer: The genotype of a fruit fly which physically expresses red eye is (ee) Explanation: The red eyes trait (e) is recessive to black eyes (E) that is, the black eyes trait (E) is dominant over the red eyes trait (e). What are the possible genotype(s) for white eyes ? In order to see with color was dominant, Morgan. Using Punnett squares, find the possible eye colors of the F1 generation for each of the following crosses. The brick-red color of the eyes of the wild type fly are due to two pigments. 6) A female fly has w ite eyes, and the male fly is homozyg s dominant for red eyes. What is the Denotyplc and phenotypic ratio of the offspring? What is the sex and eye color of flies with the following genotype: X RY? which of the following is the best conclusion you can make about the parents of this generation? Some fruit flies bred in the wild have red eyes. This result obtained is not the same as expected from the normal Mendelian ratio. All of the offspring in the F1 generation had red eyes and long wings. In fruit flies, red eyes are dominant (E). A purebreeding red-eyed fly with vestigial wings was crossed with a pure-breeding purple-eyed fly with normal wings. A)male with red eyes B)female with white eyes C)fem - the answers to estudyassistant.com Two types of fruit flies should start to appear day by day: flies with white and red eyes. (White eyes are X-linked, recessive) A. i) In fruit flies, the gene for red eyes (R) is dominant over the gene for white eyes (r). these alleles are located on the x chromosome. The gene for eye color in fruit flies is actually sex-linked on the X-chromosome. RR and rr Rr only Rr and RR < I think its this one RR, Rr, and rr In fruit flies, red eyes are dominant over sepia (brownish) eyes. These range in color from red to sepia to white and indicate a great deal about the fly's genetic makeup. White eyes are recessive (e). In fruit flies, the allele for white eyes is recessive to the allele for red eyes. (hint: you many want to complete a punnett square. White, vermillion and cinnabar-eyed fruit flies result from mutations and are far less common. Therefore, for the red eyes trait to manifest physically the genotype must appear as a homozygous allele (ee) if a heterozygous red-eyed female is mated with a white-eyed male, what percentage of the offspring are expected to be white-eyed females? Red (R) is dominant to white (r). Flies normally have red eyes but in January, 1910, we found a male with white eyes. Red eyes (R) in fruit flies are dominant over white eyes (r). D:RR, Rr, and rr 6) If the female fly has white eyes and the male fly has homozygous dominant red eyes, what are the possible phenotypes and genotypes of their offspring? C. 50%. Brown and sepia eyes are a result of a recessive gene and only occur when two sepia-eyed flies mate. Wild type fruit flies are yellow-brown, with brick-red eyes and transverse black rings across the abdomen. Cross two heterzygotes. In fruit flies, red eyes (pr+_) are dominant to purple eyes (prpr) and normal wings (vg+_) are dominant to vestigial wings (vgvg). A. A:RR and rr. Autosomal dominant e. Incompletely dominant A male fruit fly (Drosophila melanogaster) with red eyes and long wings was mated with a female with purple eyes and vestigial wings. Most flies have red eyes, but the sepia eye trait is recessive. Answer: 3 question In fruit flies, eye color is a sex linked trait. B. In fruit flies, red eyes (E) are dominant to white eyes (e). B:Rr only. However, a mutation on the white gene in fruit flies on the X chromosome prevents any eye color from developing at all (“The Genetics of Eye Color”). 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