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Title: What is the resulting punnet square? Post by: Trinity.F on May 2, 2016 The colour of eyes in fruit flies is determined by a gene on the X chromosome with two alleles. XR = red eyes; Xr = white eyes. Cross a red-eye male with a white-eyed female. Show the genotypes and phenotypes, with their ratios, including the sex of the parents and offspring.
Title: Re: What is the resulting punnet square? Post by: leesajohnson on Sep 27, 2016 Punnett squares are used to predict phenotypes from genotypes. They are a bit old-fashioned, except for simple male/female one gene matches, so we use branching diagrams more often these days.
The standard usage involves:- 1. Determining the possible gametes, and their proportions/ratio. 2. Calculating the expected diploid progeny from these gametes. |