2. With Drosophila flies, eye color is an X-linked trait while leg length is an

Question

2. With Drosophila flies, eye color is an X-linked trait while leg length is an autosomal trait. For eye color, red (R) is dominant to white (r). For leg length, long legs (L) is dominant to stubby legs (). A female fly that is heterozygous for red eyes and heterozygous for leg length is mated with a male fly with white eyes and stubby legs. a) What is the genotype of the female fly? b) What is the genotype of the male fly? c) Create a Punnett square that gives rise to the Fl generation d) What is the probability (as a fraction) of the Fl offspring: i. having red eyes and long legs? ii. having white eyes and long legs? ii having stubby legs? iv. being female with white eyes and stubby legs? . Flower position, stem length, and seed shape were three traits that Mendel studied. Each trait is controlled by an independently assorting gene and has dominant and recessive expression as follows: TRAIT Flower position Stem length RECESSIVIE Terminal (a) Dwarf (t) Wrinkled (r) DOMINANT Axial (A) Tall Round (R Seed sha As seen in the table, the alleles for each dominant and recessive trait is provided. If a plant that is heterozygous for all three traits were allowed to self-fertilize, calculate the probability (as a fraction) of the following F1 offspring genotypes or phenotypes: a) b) c) d) homozygous recessive for the three traits heterozygous for the three traits homozygous for axial and tall, heterozygous for seed shape axial, tall, and wrinkled in phenotype

Explanation / Answer

2a) The genotype of the female fly is XRXr/Ll - Red eye, long leg female

b) The genotype of the male fly is XrY/ll - White eye, stubby leg male

c) The punett square is as follows:

XRXr/Ll

Red eye, long leg female

XRXr/ll

Red eye, stubby legs female

XrXr/Ll

White eyes, long leg female

XrXr/ll

White eye, stubby leg female

XRXr/Ll

Red eye, long leg female

XRXr/ll

Red eye, stubby leg female

XrXr/Ll

White eye, long leg female

XrXr/ll

White eye, stubby leg female

XRYr/Ll

Red eye, long leg male

XRYr/ll

Red eye, stubby leg male

XrYr/Ll

White eye, Long leg male

XrYr/ll

White eye, stubby leg male

XRYr/Ll

White eye, long leg male

XRYr/ll

Red eye, stubby leg male

XrYr/Ll

White eye, long leg male

XrYr/ll

White eye, stubby leg male

d) Having red eyes and long legs - 4/16

Having white eyes and long legs - 4/16

Having stubby legs - 8/16

Female with white eyes and stubby legs - 2/16

XR/L XR/l XrL Xrl Xr/l

XRXr/Ll

Red eye, long leg female

XRXr/ll

Red eye, stubby legs female

XrXr/Ll

White eyes, long leg female

XrXr/ll

White eye, stubby leg female

Xr/l

XRXr/Ll

Red eye, long leg female

XRXr/ll

Red eye, stubby leg female

XrXr/Ll

White eye, long leg female

XrXr/ll

White eye, stubby leg female

Yrl

XRYr/Ll

Red eye, long leg male

XRYr/ll

Red eye, stubby leg male

XrYr/Ll

White eye, Long leg male

XrYr/ll

White eye, stubby leg male

Yrl

XRYr/Ll

White eye, long leg male

XRYr/ll

Red eye, stubby leg male

XrYr/Ll

White eye, long leg male

XrYr/ll

White eye, stubby leg male

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