![]() Since the father is homozygous (wwhh), you know that all of the father's sperm will be 'wh'. To test whether baby dragons with wings and baby dragons without wings will be equally likely to have big horns, you will carry out a simulation of the simultaneous inheritance of the genes for wings and horns. Procedure to Test Inheritance of Two Genes on Different Chromosomes Notice that, because the father is homozygous for both genes, all his sperm have the same genotype, so all four rows are identical.Ĭonsidering only the baby dragons with wings, what fraction do you expect to have big horns? (To answer this question, it may be helpful to begin by shading in the two columns of the above Punnett square that include all the baby dragons with wings.)Ĭonsidering only the baby dragons without wings, what fraction do you expect to have big horns?ĭo you expect that baby dragons with wings and without wings will be equally likely to have big horns? This type of mating involving two different genes is more typically shown as a Punnett square with four rows and four columns (see below). Then, fill in the genotypes of the baby dragons that result from each zygote and sketch in the characteristics of each baby dragon to show the phenotype for each genotype. In the following chart, label the gene on each chromosome in each type of zygote that could be produced by a mating between this mother and father. The next step in predicting the inheritance of the wing and horn genes is to predict the outcome of fertilization between these eggs and sperm. What genotypes or genotype of sperm can the homozygous (wwhh) father dragon produce? Draw a diagram to show how meiosis would occur in the father, starting with a diploid cell ready to undergo meiosis 1 and ending with four haploid sperm. Describe this difference and the effect that this has on the genotypes of the eggs produced. Notice that, in a cell that is prepared for meiosis 1, the homologous chromosomes are always paired with each other, but the specific arrangement of the chromosomes can differ. Considering both the wing and horn genes, what different genotypes of eggs could the heterozygous mother dragon produce? Use the figure below to answer this question. ![]() ![]() To predict the inheritance of the wing and horn genes, you first need to determine the genotypes of the eggs produced by the heterozygous (WwHh) mother dragon and the sperm produced by the homozygous (wwhh) father dragon. On average, what fraction of the baby dragons will have big horns? Predictions of Inheritance of Two Genes on Different Chromosomes \)ĭraw a Punnett Square to show the inheritance of the horn alleles for a mating between this mother and father. ![]()
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