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All white-eyed flies are males due to a genetic mutation linked to the X chromosome. In Drosophila melanogaster, the white eye color trait is caused by a recessive allele located on the X chromosome. Since males have only one X chromosome (XY), any mutation on that chromosome will manifest, resulting in white eyes. In contrast, females have two X chromosomes (XX) and would require two copies of the recessive allele to exhibit white eyes, making it rare for females to show this trait.
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What if in the above cross 100 males were produced and 200 females how many total red eyed flies would there be?
If 100 out of the 300 flies are males, and all males have red eyes, then 100 red-eyed male flies would be produced. If 50% of the 200 female flies have red eyes, then 100 red-eyed female flies would also be produced. Therefore, there would be a total of 200 red-eyed flies: 100 males and 100 females.
How did Morgan determine that red-eye color is Drosophila is an X-linked trait?
Morgan determined that red-eye color in Drosophila is an X-linked trait by conducting a series of genetic crosses. He observed that when he crossed white-eyed males (mutants) with red-eyed females (wild type), all the F1 offspring had red eyes. When he then crossed F1 males with F1 females, he found a 3:1 ratio of red-eyed to white-eyed flies among the males, indicating that the trait was linked to the X chromosome. This inheritance pattern suggested that the white-eye mutation was recessive and located on the X chromosome, confirming its X-linked nature.
Explain why morgan did not find white-eyed female d melanogaster in the f2 generation when he crossed white-eyed males with red-eyed females?
Morgan did not find white-eyed female Drosophila melanogaster in the F2 generation because the gene for eye color is located on the X chromosome. Since the white eye trait is recessive and carried on the X chromosome, the F1 generation produced all red-eyed females (carrying one normal X allele from the red-eyed mother) and white-eyed males (carrying the recessive white allele inherited from the white-eyed father). Therefore, there were no white-eyed females in the F2 generation because they would need to inherit a white allele from both parents, which was not possible in this particular cross.
If a female fruit fly heterozygous for red eyes XRXr crossed with a white eyed male XrY what percent of their offspring would have white eyes?
50% of the offspring would have white eyes. This is because all females from the cross would inherit the Xr from the male, resulting in red-eyed females, while males would inherit the Xr from the female fruit fly, resulting in white-eyed males.
In an F2 generation only male fruit flies had white eyes What is this pattern of inheritance called?
Any trait that segregates strictly by sex would be a SEX-LINKED trait. So I suppose you could call this "sex-linked inheritance". In this case, it appears that there is a mutation in the "white" gene (which normally makes the pigment that turns the eyes red, by the way) on the X chromosome. Since only the males are displaying the phenotype, it would probably mean that the mother was heterozygous w/+ for this gene (+ indicates wild-type, which in this case translates to "red-eyed"). Furthermore, I can infer that the fathers were red-eyed +/Y (since if they were white-eyed, you would see some white-eyed female progeny), and that not all of the male progeny were white eyed (since half of them should have inherited the + copy of the gene). So your males should be approximately half w/Y and half +/Y, and the females should be half w/+ and half +/+. This type of inheritance called criss cross inheritance fom father to grandson through daughter.
What if in the above cross 100 males were produced and 200 females how many total red eyed flies would there be?
If 100 out of the 300 flies are males, and all males have red eyes, then 100 red-eyed male flies would be produced. If 50% of the 200 female flies have red eyes, then 100 red-eyed female flies would also be produced. Therefore, there would be a total of 200 red-eyed flies: 100 males and 100 females.
Explain why Morgan did not find white-eyed female melanogaster in the f generation when he crossed white-eyed males with red-eyes females?
Red eyed (Wild) is dominant over the recessive mutated white eye trait.White eyes is a sex-linked trait. If you cross a white eyed male with a homozygous (wild) red eyed female, all the females will be red eyed carriers and the males will be red eyed also.
When thomas hunt Morgan crossed his red-eye f1 generation flies with each other the f2 generation included both red and white eyed flies why were all the white-eyed flies male?
The white eyed flies that resulted from the crossing of the red-eye flies were all male as the gene involved was on the X chromosome. The X chromosome is the male chromosome.
What was the the result when Morgan mated fruit flies with the genotypes XRXr and XRy?
all the females had red eyes and half the males had red eyes
How did Morgan determine that red-eye color is Drosophila is an X-linked trait?
Morgan determined that red-eye color in Drosophila is an X-linked trait by conducting a series of genetic crosses. He observed that when he crossed white-eyed males (mutants) with red-eyed females (wild type), all the F1 offspring had red eyes. When he then crossed F1 males with F1 females, he found a 3:1 ratio of red-eyed to white-eyed flies among the males, indicating that the trait was linked to the X chromosome. This inheritance pattern suggested that the white-eye mutation was recessive and located on the X chromosome, confirming its X-linked nature.
Explain why morgan did not find white-eyed female d melanogaster in the f2 generation when he crossed white-eyed males with red-eyed females?
Morgan did not find white-eyed female Drosophila melanogaster in the F2 generation because the gene for eye color is located on the X chromosome. Since the white eye trait is recessive and carried on the X chromosome, the F1 generation produced all red-eyed females (carrying one normal X allele from the red-eyed mother) and white-eyed males (carrying the recessive white allele inherited from the white-eyed father). Therefore, there were no white-eyed females in the F2 generation because they would need to inherit a white allele from both parents, which was not possible in this particular cross.
If a female fruit fly heterozygous for red eyes XRXr crossed with a white eyed male XrY what percent of their offspring would have white eyes?
50% of the offspring would have white eyes. This is because all females from the cross would inherit the Xr from the male, resulting in red-eyed females, while males would inherit the Xr from the female fruit fly, resulting in white-eyed males.
What was the result when Morgan mates a white eyed male fruit with a red eyed female fruit fly?
When Morgan mated a white-eyed male fruit fly with a red-eyed female fruit fly, the first generation offspring all had red eyes. In the next generation, because females would have the X chromosome for white eyes, about half the offspring would have white eyes. The offspring with white eyes were all male, meaning he discovered eye color in fruit flies showed a sex-linked trait. The result of this was a generation of red eyed and white eyed individuals. If the red eyed female was heterozygous, this is possible.
What was the result when Morgan mated a white eyed male fruit fly with a red eyed female fly?
When Morgan mated a white-eyed male fruit fly with a red-eyed female fruit fly, the first generation offspring all had red eyes. In the next generation, because females would have the X chromosome for white eyes, about half the offspring would have white eyes. The offspring with white eyes were all male, meaning he discovered eye color in fruit flies showed a sex-linked trait. The result of this was a generation of red eyed and white eyed individuals. If the red eyed female was heterozygous, this is possible.
What was the result when Morgan mated a white eyed fruit fly with a red eyed female fruit fly?
When Morgan mated a white-eyed male fruit fly with a red-eyed female fruit fly, the first generation offspring all had red eyes. In the next generation, because females would have the X chromosome for white eyes, about half the offspring would have white eyes. The offspring with white eyes were all male, meaning he discovered eye color in fruit flies showed a sex-linked trait. The result of this was a generation of red eyed and white eyed individuals. If the red eyed female was heterozygous, this is possible.
What was the result when Morgan mated a white-eyed male fruit fly with a red eyed female fruit fly?
When Morgan mated a white-eyed male fruit fly with a red-eyed female fruit fly, the first generation offspring all had red eyes. In the next generation, because females would have the X chromosome for white eyes, about half the offspring would have white eyes. The offspring with white eyes were all male, meaning he discovered eye color in fruit flies showed a sex-linked trait. The result of this was a generation of red eyed and white eyed individuals. If the red eyed female was heterozygous, this is possible.
What was the result when Morgan mated a white eyed male fruit fly with red eyed female fruit fly?
When Morgan mated a white-eyed male fruit fly with a red-eyed female fruit fly, the first generation offspring all had red eyes. In the next generation, because females would have the X chromosome for white eyes, about half the offspring would have white eyes. The offspring with white eyes were all male, meaning he discovered eye color in fruit flies showed a sex-linked trait. The result of this was a generation of red eyed and white eyed individuals. If the red eyed female was heterozygous, this is possible.
