B. In fruit fly, Drosophila, the genes for vestigial wings, white eyes, and black body ar linked. These genes are recessive. A fruit fly strain that is homozygous for white eyes wa crossed with a strain that is homozygous for vestigial wings and black body. The F1 wer then testcrossed, and the resulting offspring were as follows: Phenotype Number wild type (dominant for all traits) 9 white eyes 1779 vestigial wings 241 black body 131 vestigial wings, black body 1654 vestigial wings, white eyes 118 white eyes, black body 252 vestigial wings, white eyes, black body 13 1. Calculate the map distance between the genes for a. vestigial wings and white eyes b. vestigial wings and black body c. white eyes and black body 2. What is the correct order of gene in the chromosome?

We will see an MII pattern when: There is no crossover between a gene and its centromere There is crossover between two genes There is crossover between two centromeres There is crossover between a gene and its centromere There is no crossover between two genes

. The following pedigree is for a dominant phenotype governed by an autosomal allele. What does this pedigreesuggest about the phenotype, and what can you deduceabout the genotype of individual A?

In silk moths red eyes (r) and white banded wing (w) are recessive to normal eyes (R) and 10m.u. apar normal wings (W). A moth homozygous for red eyes and white banded wings is crossed with an individual who is homozygous normal for both traits. The F, progeny are testcrossed with the following progeny produced: Normal eyes, normal wings Red eyes, normal wings 19 Normal eyes, white banded wings Red eyes, white banded wings 426 a. What phenotypic proportions would be expected if the genes for red eyes and white banded wings were located on different chromosomes? b. What is the genetic distance between these two genes? 418 16

In Drosophila, the allele for long legs (sl*) is wild-type and the allele for short legs (sl) is mutant. The allele for gray body color (b*) is wild-type and the allele for black body color (b') is mutant. The loci for leg length and body color are linked. Flies with sl*sl* b*b* genotypes are mated with flies that have sl s bb genotypes. A testcross was then performed in which the F, offspring with sl*sl b*b genotypes were mated with flies with sl sl. b'b genotypes. The phenotypes of 1000 offspring were recorded. There were 470 flies with long legs and grey body, 30 flies with long legs and black body, 30 flies with short legs and grey body, and 470 flies with short legs and black body. Which of these phenotypes are parental phenotypes? VWhich of these phenotypes are recombinant phenotypes? What is the distance between these two gene loci in centiMorgans (map units)?

Answer was wrong

homozygous recessive: 3) Round seeds are dominant over wrinkled seeds in pea plants. Fill in the Punnett square and determine the expected genotypes and phenotypes of the F₁ generation by crossing homozygous recessive and heterozygous parents. J Possible genotypes of offspring: Possible phenotypes of offspring: Percentage of offspring that are round: % of offspring that are homozygous dominant: heterozygous: J j J j J j j J j J j Fi generation If there were 3500 seeds collected, predict how many would be round? Predict how many seeds would be homozygous dominant? homozygous recessive: % wrinkled: % % homozygous recessive: wrinkled? heterozygous? % %

Dr. P was using Drosophila to follow the inheritance patterns of two traits: body shape and wing size. Dr.P began her experiment by crossing wild type, homozygous dominant, males with double mutant, homozygous recessive, females. She then performed a testcross by mating Fi generation males with double mutant, homozygous recessive, females and observed the phenotypes of the F2 generation. Shorthand of the different alleles is annotated as follows: Wild type round body shape allele = b* Wild type large wing size =w* Mutant rectangle body shape allele = b Mutant small wing size = w A) Complete the table by indicating the genotypes for each generation of male and female flies. Male Genotype Female Genotype P generation F, generation testcross When Dr.P characterized and counted the F2 phenotypes, she determined the following: Round-large Rectangle-small 332 flies Round-small Rectangle-large 357 flies Number of flies 344 flies 360 flies B) Using the data above, would you be surprised (yes…