Homework Answers
Fruit flies are dioecious in nature. There sexuality does not depend on X and You chromosome rather on X:autosome ratio.
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Fruit flies are sexually reproducing insects with separate male and female individuals. Like most mammals, including...
Female fruit flies typically have two X chromosomes; male fruit flies typically have one X and...
Female fruit flies typically have two X chromosomes; male fruit flies typically have one X and one Y chromosome. They have other chromosomes too that are NOT sex chromosomes. Suppose there is a gene in fruit flies that influences the hairs a fly has on its thorax (the middle section of its body). A recessive allele of this gene causes the hairs to be very thick, while a dominant allele causes the hairs to be very thin. Suppose a heterozygous...
Fruit flies normally have dull red eyes. Some fruit flies have white eyes due to mutation...
Fruit flies normally have dull red eyes. Some fruit flies have white eyes due to mutation in a gene on the X-chromosome. The white eyed phenotype is X-linked recessive. The sex chromosomes in fruit flies are: females, normally XX; males, normally XY. If a white-eyed female (mutant phenotype) mates with a red-eyed male (normal or wild- type phenotype), what is the likelihood that their female offspring will have red eyes? Parents: white-eyed female X red-eyed male Select one: a. O...
29, In fruit flies, red eyes are dominant over white eyes. The gene for eye color...
29, In fruit flies, red eyes are dominant over white eyes. The gene for eye color (R) is found on the X chromosome (X^R). Females have 2 X chromosomes and males are XY. Fill in the following (case sensitive!): Genotype of a white eyed female: Possible female gametes; separate gametes with a comma (,): Genotype of a red eyed male: Possible male gametes; separate gametes with a comma (,): In fruit flies, red eyes are dominant over white eyes. The...
Fruit flies normally have dull red eyes. Some fruit flies have white eyes due to a...
Fruit flies normally have dull red eyes. Some fruit flies have white eyes due to a mutation in a gene on the X-chromosome. The white eyed phenotype is X-linked recessive. The sex chromosomes in fruit flies are: females, normally XX; males, normally XY. If a red-eyed female who is a carrier of the white eyed allele (normal or wild-type phenotype) mates with a white-eyed male (mutant phenotype), what is the likelihood that their male offspring will have red eyes? Parents:...
Fruit flies normally have dull red eyes. Some fruit flies have white eyes due to a...
Fruit flies normally have dull red eyes. Some fruit flies have white eyes due to a mutation in a gene on the X-chromosome. The white eyed phenotype is X-linked recessive. The sex chromosomes in fruit flies are: females, normally XX; males, normally XY. If a true breeding red-eyed female (normal or wild-type phenotype) mates with a white- eyed male (mutant phenotype), what is the likelihood that their male offspring will have white eyes? Parents: red-eyed female X white-eyed male Select...
You make cross between a male fruit fly with wrinkled wings and a female fly with...
You make cross between a male fruit fly with wrinkled wings and a female fly with vestigial wings. All of the F1 flies are have wrinkled wings. A cross between an F1 female fly and an F1 male fly yields the following offspring: 45 wrinkled-wing males 51 wrinkled-wing females 18 vestigial-wing males 14 vestigial-wing females What do you hypothesize as the mode of inheritance for this trait?
please show work and justify your answer. Now assume each male+female pair has 4 offspring (2M...
please show work and justify your answer.
Now assume each male+female pair has 4 offspring (2M + 2F), and asexuals still have two offspring per generation. What is the cost of sex? Males Females Total Asexual (M+F)/ Asexual Gen 1 2 2 4 Gen 2 Gen 3 Gen 4 Gen 5 O Sexually reproducing females have the same fitness as the asexually reproducing individuals O Sexually reproducing females have half the fitness as the asexually reproducing individuals O Sexually reproducing...
Evolution theory predicts a physiological cost of increased reproduction that translates in short...
Evolution theory predicts a physiological cost of increased reproduction that translates in shorter life span. The data file Large.Fruitftly describes a study of the cost of sexual activity in male Drosophila. The authors randomly assigned male fruit flies to five sex conditions. In the first condition, the males were kept alone. In the second condition, each male was placed in the company of one virgin female (replaced every other day with a new virgin female to provide reproductive opportunities). The...
Several crosses were made between female fruit flies with yellow bodies and short bristles and male...
Several crosses were made between female fruit flies with yellow bodies and short bristles and male flies with tan bodies and long bristles. The flies were from a mixed population, so they were not necessarily true breeding. The results are shown below. Cross 1: Females all tan with short bristles; males all yellow with short bristles Cross 2: Females half tan with short bristles, half tan with long bristles; Males half yellow with short bristles; half yellow with long bristles....
1.a) How do we know that in humans the X chromosomes play no role in sex...
1.a) How do we know that in humans the X chromosomes play no role in sex determination, while the Y chromosome causes maleness and its absence causes femaleness? c) How do we know that X chromosomal inactivation of either the paternal or maternal homolog is a random event during early development in mammalian females? d) How do we know that Drosophila utilizes a different sex-determination mechanism than mammals, even though it has the same sex-chromosome compositions in males and females?...
Fruit flies normally have dull red eyes. Some fruit flies have white eyes due to mutation in a gene on the X-chromosome. The white eyed phenotype is X-linked recessive. The sex chromosomes in fruit flies are: females, normally XX; males, normally XY. If a white-eyed female (mutant phenotype) mates with a red-eyed male (normal or wild- type phenotype), what is the likelihood that their female offspring will have red eyes? Parents: white-eyed female X red-eyed male Select one: a. O...
Fruit flies normally have dull red eyes. Some fruit flies have white eyes due to a mutation in a gene on the X-chromosome. The white eyed phenotype is X-linked recessive. The sex chromosomes in fruit flies are: females, normally XX; males, normally XY. If a red-eyed female who is a carrier of the white eyed allele (normal or wild-type phenotype) mates with a white-eyed male (mutant phenotype), what is the likelihood that their male offspring will have red eyes? Parents:...
Fruit flies normally have dull red eyes. Some fruit flies have white eyes due to a mutation in a gene on the X-chromosome. The white eyed phenotype is X-linked recessive. The sex chromosomes in fruit flies are: females, normally XX; males, normally XY. If a true breeding red-eyed female (normal or wild-type phenotype) mates with a white- eyed male (mutant phenotype), what is the likelihood that their male offspring will have white eyes? Parents: red-eyed female X white-eyed male Select...
please show work and justify your answer.
Now assume each male+female pair has 4 offspring (2M + 2F), and asexuals still have two offspring per generation. What is the cost of sex? Males Females Total Asexual (M+F)/ Asexual Gen 1 2 2 4 Gen 2 Gen 3 Gen 4 Gen 5 O Sexually reproducing females have the same fitness as the asexually reproducing individuals O Sexually reproducing females have half the fitness as the asexually reproducing individuals O Sexually reproducing...
Evolution theory predicts a physiological cost of increased reproduction that translates in shorter life span. The data file Large.Fruitftly describes a study of the cost of sexual activity in male Drosophila. The authors randomly assigned male fruit flies to five sex conditions. In the first condition, the males were kept alone. In the second condition, each male was placed in the company of one virgin female (replaced every other day with a new virgin female to provide reproductive opportunities). The...
Several crosses were made between female fruit flies with yellow bodies and short bristles and male flies with tan bodies and long bristles. The flies were from a mixed population, so they were not necessarily true breeding. The results are shown below. Cross 1: Females all tan with short bristles; males all yellow with short bristles Cross 2: Females half tan with short bristles, half tan with long bristles; Males half yellow with short bristles; half yellow with long bristles....
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