Question

can you please help me with number 4?

An example of linked genes in Drosophila The genes for wing shape and body color are linked (they are on the same chromosome) Drosophila and linked genes In the example shown left, wild type alleles are dominant and are given an upper case symbol of the mutant phenotype (Cu or Eb). This notation used for Drosophila departs from the convention of using the dominant gene to provide the symbol. This is necessary because there are many mutant alternative phonotypes to the wild typo (e.g. curled and vestigial wings). A lower case symbol of the wild type (0.g. ss for straight wing) would not indicate the mutant phenotype involved. Parent Wild type femalo Mutant malo Phenotype Straight wing Gray body Curled wing Ebony body Genotype Drosophila melanogaster is known as a model organism. Model organisms are used to study particular biological phenomena, such as mutation. Drosophila melanogaster is particularly useful because it produces such a wide range of heritable mutations. Its short reproduction cycle, high offspring production, and low maintenance make it Ideal for studying in the lab. Cucu Ebeb cucu ebeb C# Eb Web S C Ceb Ceb - Melosis Linkage O Gamotes from female fly (N) Gametes from male fly (N) Drosophila melanogaster examples showing variations in eyo and body color. The wild type is marked with a w in the photo above. Sex of offspring is irrelevant in this case 3. Complete the linkago diagram above by adding the gametes in the ovals and offspring genotypes in the rectangles. 4. (a) List the possible genotypes in the offspring (above, left) if genes Cu and Eb had been on separate chromosomes: (b) If the female Drosophila had been homozygous for the dominant wild type alleles (Cucu EbEb), stato: The genotype(s) of the F : _ _ The phenotype(s) of the F:.

Answer 1

4) a) genotype of the female is CucuEbeb and genotype of the male is cucuebeb

if the genes are not linked on a chromosome the genotype of the gametes that can be produced by the female are CuEb, Cueb, cuEb, cueb and the gametes produced by the male parent is cueb.

CucuEbeb * cucuebeb.

	CuEb	Cueb	cuEb	cueb
cueb	CucuEbeb ( straigt wings, gray body)	Cucuebeb ( straight wings, ebony body)	cucuEbeb ( curly wings, gray body)	cucuebeb ( curly wings, ebony body)

so the possible phenotypes of the progeny are

straight wings, gray body.

straight wings, ebony body.

curly wings, gray body.

curly wings, ebony body.

b) CuCuEbEb * cucucebeb

CucuEbeb

the genotype of the F1 is CucuEbeb, and the phenotype of the F1 is straight wings and gray body.