Posted On: Nov. 21, 2017
Name Homework #1 Mendelian Genetics Exercise Youtubes to show you how to do Punnett squares if needed. If you panick, send me an email. I will be there to help. http://www.youtube.com/watch?v=d4izVAkhMPQ http://www.youtube.com/watch?v=prkHKjfUmMs http://www.youtube.com/watch?v=_ksIajiPUAU Answer the following questions. Show your work as appropriate. 1. Two alleles code for the ability to roll the tongue. The allele R (ability to the roll the tongue) is dominant; allele r (cannot role the tongue) is recessive. a) A person who cannot roll the tongue can have the genotype(s): b) A person who can roll the tongue can have the genotype(s): c) The gametes of a heterozygous man who can roll the tongue may contain which allele(s)? d) The gametes of a woman who cannot roll the tongue may contain which allele(s)? e) What are all the possible genotype(s) of the offspring that c) and d) can produce? f) What genotypic ratios are likely to occur? What phenotypic ratios are likely to occur? g) If this couple has four children, is it possible for all of the children cannot role the tongue? Why or why not? 2. Achondroplastic dwarfism is a dominant trait that causes dwarfism in individuals who carry this gene. A male who cannot roll the tongue who is heterozygous for achondroplastic dwarfism marries a woman who is heterozygous for rolling the tongue and is of normal size. A = achondroplastic dwarfism R = roll the tongue a = normal size r = cannot roll the tongue a) What are the genotypes of the two people? man: woman: b) What are the possible types of gametes that each of these people can produce? man: woman: c) What are all the possible genotypes and the associated phenotypes of the offspring that the two people can produce?