In Drosophila melanogaster, the phenotype “curly wings” is due to a dominant allele Cy that is...
- In Drosophila melanogaster, the phenotype “curly wings” is due to a dominant allele Cy that is lethal when homozygous. A population is established with an initial frequency of Cy equal to 0.168. Calculate the expected frequency in the next generation, assuming:
- that the relative fitness (w) of +/+ and Cy/+ are both 1.0
- that the relative fitness (w) of +/+ is 1.0 and Cy/+ is 0.5
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In Drosophila melanogaster, the phenotype “curly
wings” is due to a dominant allele Cy that is...
4. In Drosophila melanogaster, the phenotype curly wings is due to a mutant allele Cy that...
4. In Drosophila melanogaster, the phenotype curly wings is due to a mutant allele Cy that is lethal when homozygous. A population is established with an initial frequency of Cy equal to 0.168. Denoting + as the wild- type (i.e. non-mutant) allele at this locus, calculate the expected frequency of Cy in the next generation if the relative fitness of the ++ homozygote to the Cy/+ heterozygote is: a) 1 : 1 b) 1 : 0.5 c) Briefly explain why...
In Drosophila, glued eyes is due to a dominant allele Ge that is lethal when homozygous....
In Drosophila, glued eyes is due to a dominant allele Ge that is lethal when homozygous. A population is established with an initial frequency of Ge equal to 0.178. Calculate the expected frequency in the next generation (p’) assuming: a. The relative fitness of +/+: Ge/+ is 1:1 b. the relative fitness of +/+: Ge/+ is 1:0.5
1. In Drosophila (fruit flies) Curly (c) wings are recessive and normal (C) wings are dominant....
1. In Drosophila (fruit flies) Curly (c) wings are recessive and normal (C) wings are dominant. If you cross curly wing flies with homozygous normal wing what is the expected genotype and phenotype of the F1 generation? What is the expected phenotypic ratio of the F2 generation?
The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by an autosomal recessive...
The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by an autosomal recessive mutant allele that independently assorts with an autosomal recessive mutant allele for hairy (h) body. A parental cross was made between a fly that is homozygous for normal wings with a hairy body and a fly with vestigial wings that is homozygous for normal body hair. The wild-type F1 flies were crossed to each other and produced 1536 offspring. The phenotypes of the F2...
The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by an autosomal recessive...
The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by an autosomal recessive mutant allele that independently assorts with an autosomal recessive mutant allele for hairy (h) body. A parental cross was made between a fly that is homozygous for normal wings with a hairy body and a fly with vestigial wings that is homozygous for normal body hair. The wild-type F1 flies were crossed to each other and produced 1536 offspring. The phenotypes of the F2...
The Curly (Cy) mutant in fruit flies causes curled up wings. This mutant is due to...
The Curly (Cy) mutant in fruit flies causes curled up wings. This mutant is due to an autosomal dominant mutation that exhibits 80% penetrance. The miniature body (m) phenotype is due to an X-linked recessive mutation and is completely penetrant. A male with normal body size and heterozygous for the Cy mutation is crossed to a female with normal wings and miniature body. What is the probability of obtaining progeny flies from this cross that are males with miniature bodies...
Assortment of genes on same chromosome In the fruit fly Drosophila, there is a dominant gene...
Assortment of genes on same chromosome In the fruit fly Drosophila, there is a dominant gene for normal wings and its recessive allele for vestigial wings. At another gene locus. there is a dominant gene for red eyes and its recessive allele for purple eyes. A female that was heterozygous at both gene loci was mated with a male that is homozygous for both recessive alleles. Knowing this, complete the sentences with the correct terms. 94% crossing over independent assortment...
1. Fixation of Dominant Alleles Start with a population that has a gene with two alleles (A and a...
1. Fixation of Dominant Alleles Start with a population that has a gene with two alleles (A and a) with classical Mendelian dominance that are at equal frequency (p0.5. q 0.5). Assume this first generation is at hardy Weinberg equilibrium. Calculate the genotype frequencies AA- a. Aa b. Now assume some environmental change that makes the recessive phenotype completely unfit (fitness- 0). Calculate the allele frequencies and genotype frequencies in the second generation. (Hint: Your calculations might be easier if...
3. Initial cross: Now become familiar with the phenotype of Cy/Pm D/Sh fties and with the...
3. Initial cross: Now become familiar with the phenotype of Cy/Pm D/Sh fties and with the phenot of the mutant stock of flies your instructor has chosen for you to identify as to linkage group To locate the selected mutant gene in its linkage group or chromosome, roceed as follows: Select virgin females homozygous for the mutant gene arbitrarily designate the allele as m) that you are to locate. Mate such virgin mutant females to Cy/Pm D/Sb males. 4. What...
Purple eyes (or), black body (b) and vestigial wings (vg) are recessive alleles in Drosophila melanogaster....
Purple eyes (or), black body (b) and vestigial wings (vg) are recessive alleles in Drosophila melanogaster. Apr prb bvg" vg trihybrid is crossed to a fly homozygous for the recessive allele at each locus. The following numbers of offspring are observed. Phenotype Number of progeny Unordered genotypes Ordered genotypes Wild type 92 188 1241 vg 7 pr, b 8 pr, vg 1243 b, vg 190 pr, b, vg Total: 2990 1. Write the full, unordered genotypes of each category Comit...
Assortment of genes on same chromosome In the fruit fly Drosophila, there is a dominant gene for normal wings and its recessive allele for vestigial wings. At another gene locus. there is a dominant gene for red eyes and its recessive allele for purple eyes. A female that was heterozygous at both gene loci was mated with a male that is homozygous for both recessive alleles. Knowing this, complete the sentences with the correct terms. 94% crossing over independent assortment...
1. Fixation of Dominant Alleles Start with a population that has a gene with two alleles (A and a) with classical Mendelian dominance that are at equal frequency (p0.5. q 0.5). Assume this first generation is at hardy Weinberg equilibrium. Calculate the genotype frequencies AA- a. Aa b. Now assume some environmental change that makes the recessive phenotype completely unfit (fitness- 0). Calculate the allele frequencies and genotype frequencies in the second generation. (Hint: Your calculations might be easier if...
3. Initial cross: Now become familiar with the phenotype of Cy/Pm D/Sh fties and with the phenot of the mutant stock of flies your instructor has chosen for you to identify as to linkage group To locate the selected mutant gene in its linkage group or chromosome, roceed as follows: Select virgin females homozygous for the mutant gene arbitrarily designate the allele as m) that you are to locate. Mate such virgin mutant females to Cy/Pm D/Sb males. 4. What...
Purple eyes (or), black body (b) and vestigial wings (vg) are recessive alleles in Drosophila melanogaster. Apr prb bvg" vg trihybrid is crossed to a fly homozygous for the recessive allele at each locus. The following numbers of offspring are observed. Phenotype Number of progeny Unordered genotypes Ordered genotypes Wild type 92 188 1241 vg 7 pr, b 8 pr, vg 1243 b, vg 190 pr, b, vg Total: 2990 1. Write the full, unordered genotypes of each category Comit...
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