Methods in Anopheles Research - MR4

Chapter 2 : Anopheles Biology Laboratory and Culture2.5 Basic Anopheles Mendelian GeneticsPage 5 of 8Sex linkageProblem 2: Again, use a Punnett Square to illustrate the pattern. This example uses the sex-linkedmarker white (w) which is located on the X chromosome (Benedict et al. 1996). The w+ allele is fullydominant over the w allele. The cross is between a heterozygous female and a hemizygous male whocarries the w+ allele. Fill in the pheno- and genotypes including sex.Female Gametes2a. w+ proportion = ……………. 2b. w proportion = …………….2c. w+ proportion =2e. w+ / w+ proportion =2e. w+ / w proportion =Male Gametes…………….2d. Y proportion =…………….……………………Sex = ………2e. w+ Y proportion =…………………Sex = …………………………..Sex = ………2e. w Y proportion =………………..Sex = ………Note that among the progeny, females and males occur at different frequencies in each eye-colorphenotypic class.Determine the genotypic frequencies2i. w+ / w female ____________2j. w / w female ____________2k. w+ / w+ female ____________2l. w / Y (male) ____________2m. w+ / Y (male) ____________Determine the phenotypic frequencies2n. w+ female ____________2o. w female ____________2p. w+ male ____________2q. w male ____________