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 scarlet Number 134 16 136 694 156 736 scarlet, spineless spineless (a) (b) 20 108 What indicates that the genes are linked? What was the genotype of What is the order of the genes? original heterozygous females?

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genetics, pleaseeee solve parts a, b and c

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:
Number
Phenotype
wild-type
ebony
ebony, scarlet
ebony, spineless
ebony, scarlet, spineless
134
16
136
694
156
scarlet
736
scarlet, spineless
spineless
(a)
(b)
(c)
(d)
20
108
What indicates that the genes are linked?
What was the genotype of the original heterozygous females?
What is the order of the genes?
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.
Transcribed Image Text: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: Number Phenotype wild-type ebony ebony, scarlet ebony, spineless ebony, scarlet, spineless 134 16 136 694 156 scarlet 736 scarlet, spineless spineless (a) (b) (c) (d) 20 108 What indicates that the genes are linked? What was the genotype of the original heterozygous females? What is the order of the genes? 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.
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