You are breeding butterflies, and are interested in determining the relationship
ID: 199417 • Letter: Y
Question
You are breeding butterflies, and are interested in determining the relationship of three different traits your particular species expresses. Wild type butterflies have a black body (B), blue eyes (E), and gold wings (G). But each of these genes also has a mutant allele. Butterflies who are mutant at all three loci have a white body (b), red eyes (e) and silver wings (g). These three genes are located on different chromosomes and therefore sort independently 2. You have a true-breeding colony of butterflies with black bodies, red eyes and gold wings and another true-breeding colony of white-bodied, blue-eyed, silver- winged butterflies. You cross them and obtain the F1 progeny. a. i. Write out the genotypes of the following individuals: 1. true-breeding black body, red eye, gold wings: 2. true-breeding white-body, blue-eye, silver-wing: 3. F1 progeny:- You cross the F1 progeny to a butterfly with the genotype BBeeGg, What is the probability they obtain the following progeny: b. i. A progeny with all dominant phenotypes? ii. A progeny that is heterozygous for all three genes? 1. Are the answers to i and li the same, why or why not? ill. A progeny with the genotype BBeeGG? 1. Is the progeny with the genotype BBeeGG true-breeding, yes or no? List the different genotype(s) of the gamete(s) formed by the BBeeGG indiviual. 2.Explanation / Answer
a 1) Genotype of true breeding black body red eye gold wings = BBeeGG
2) Genotype of true breeding white body blue eye silver wings = bbEEgg
3) F1 progeny = BbEeGg genotype and phenotype = black body blue eye gold wings
b) BbEeGg which gives 8 gametes (BEG, beg, BEg, BeG, Beg,bEg,bEG beG) and BBeeGg gives gametes - BeG, Beg
i) A progeny with all dominant phenotypes - BBEeGG, BBEeGg, BBEeGg, BbEeGg,BbEeGG,BbEeGg (A phenotype can be homozygous or heterozygous dominant)
ii) A progeny that is heterozygous for all phenotyopes - BbEeGg
iii) A cross between F1 progeny BbEeGg and BBeeGG
Offsprings - BBEeGG, BBEeGg, BBeeGG,BBeeGg,BbEeGG,BbeeGg,BbEeGg,BbeeGG
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