1-If two loci are 30 cM apart, what proportion of the cells in prophase of the first meiotic division will contain a single crossover in the region between them? Explain your answer 2-Female Drosophila heterozygous for three recessive mutations e (ebony body), st (scarlet eyes), and ss (spineless bristles) were testcrossed, and the following progeny were obtained: Phenotype wild-type ebony ebony, scarlet ebony, spineless ebony, scarlet, spineless Number 134 16 136 694 156 scarlet 736 scarlet, spineless spineless 20 108 What indicates that the genes are linked? (a) (b) What was the genotype of the original heterozygous females? What is the order of the genes? (c) (d) What is the map distance between e and st? Between e and ss? 1 mark? 1 mark (f) (g) (h) What is the coefficient of coincidence? Calculate the interference? : Diagram the crosses in this experiment.
1-If two loci are 30 cM apart, what proportion of the cells in prophase of the first meiotic division will contain a single crossover in the region between them? Explain your answer 2-Female Drosophila heterozygous for three recessive mutations e (ebony body), st (scarlet eyes), and ss (spineless bristles) were testcrossed, and the following progeny were obtained: Phenotype wild-type ebony ebony, scarlet ebony, spineless ebony, scarlet, spineless Number 134 16 136 694 156 scarlet 736 scarlet, spineless spineless 20 108 What indicates that the genes are linked? (a) (b) What was the genotype of the original heterozygous females? What is the order of the genes? (c) (d) What is the map distance between e and st? Between e and ss? 1 mark? 1 mark (f) (g) (h) What is the coefficient of coincidence? Calculate the interference? : Diagram the crosses in this experiment.
Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN:9781337408332
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Chapter14: Chromosomes And Human Inheritance
Section: Chapter Questions
Problem 5GP: Human females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With...
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