Miniature wings in Drosophila melanogaster result from an X-linked gene (Xm) that is recessive to an allele for long wings (X+). Sepia eyes (s) are produced by an autosomal gene that is recessive to an allele for red eyes (s+). A female fly that is true-breeding for long wings and sepia eyes is crossed with a male that is true-breeding for miniature wings and red eyes. The F1 are intercrossed to produce the F2.
1) What are the expected genotypic and phenotypic proportions in the F1 from this parental cross?
2) Showing both phenotypic notation and phenotype, what are the expected phenotypic proportions in the F2?
Miniature wings in Drosophila melanogaster result from an X-linked gene (Xm) that is recessive to an...
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 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...
In Drosophila melanogaster, the recessive X-linked alleles white (w), miniature (m) and forked (f) give the phenotypes white eyes, miniature wings and forked brushes. The recombination between the w and m loci is 35%, and between the m and f loci, 20%. Wild-type males were crossed with females from a strain that was homozygous recessive for the three alleles, then the F1 flies were sibling mated. What phenotype frequencies are expected in F2 a) if there is no interference, and...
2.In Drosophila, yellow body is due to an X-linked gene that is recessive to the gene for gray body. (a) A homozygous gray female is crossed with a yellow male. The F1 are intercrossed to produce F2. Give the genotypes and phenotypes, along with the expected proportions, of the F1 and F 2 progeny. (b) A yellow female is crossed with a gray male. The F1 are inter- crossed to produce the F2. Give the genotypes and phenotypes, along with...
Question 3 Two true-breeding Drosophila are crossed: a normal-winged, red-eyed female and a miniature- winged, vermillion-eyed male. The Fl generation all have normal wings and red eyes. The FI offspring are crossed with miniature-winged, vermillion-eyes flies. The following offspring of that cross were counted. 233 normal wing, red eye 247 miniature wing, vermilion eye 7 normal wing, vermilion eye 13 miniature, red eye a) Explain what a testcross is (1 point). b) What is the expected phenotypic ratio from a...
Please explain in details: White eyes is an X-linked recessive mutation and curly wings is an autosomal dominant mutation in Drosophila. What proportion of red eyed, curly winged females is expected in the F2 starting with a true breeding white eyed, non-curly female mating with a true breeding red eyed curly male. a. 1/16 b. 1/8 c. 3/8 d. 3/16 e. 1/32
BIO340 Recitation 5 Spring 2020 Your professor is having you look at two genes in Drosophila fruit flies to determine experimentally whether they are linked. One trait is eye color and two alleles are present at the gene: se+ is the wild-type allele for red eyes, and se is the mutant, recessive allele for sepia eyes. The second trait is body color and two alleles are present at this gene: e+ is the wild-type allele for grey body, and e...
2. A white eyed female fly (w is a recessive allele of a gene for eye pigmentation on the X chromosome) is crossed with a red eyed male fly. a. Give the genotypes for the parental generation. b. Give the phenotypes and genotypes, and their proportions, for the F1 generation. c.Fls are crossed to one another. Give the phenotypes and genotypes, and their proportions, for the F2 generation.
EXTRA CREDIT (10 pts) 7) In Drosophila, white eye is an X-linked recessive trait and ebony body is an autosomal recessive trait. A homozygous white-eyed female (normal body) is crossed with a homozygous ebony male (normal, red eyes). a) What phenotypic ratio do you expect in the F1 generation? Show your work. b) What phenotypic ratio do you expect in the F2 generation? Show your work.
In Drosophila, the X-linked recessive mutation vermillion (v) causes bright red eyes, in contrast to the brick-red eyes caused by the wild-type allele. A separate autosomal recessive mutation, brown (bw), causes flies to have brown eyes. Flies carrying both mutations have no eye pigmentation and are white-eyed. Determine the F1 and F2 phenotypic ratios for each sex from the following crosses: (a) brown females X vermillion males (b) white-eyed females X wild-type males