Drosophila T a heterozyg chromosome 2), and hot tamale Cht). 301 307 46 36 ap ht

Question

Drosophila T a heterozyg chromosome 2), and hot tamale Cht). 301 307 46 36 ap ht + 41 ap + b ht h )5 4. Black body (b/b), curved wing(c/e), and purple eye color (pr/pr) are recessive traits known to be on chromosome 2 in Drosophila. A testcross of a heterozygous female for all 3 genes was crossed to a black bodied, curved wing. purple eyed male fly and yielded the following progeny Phenotype class Number Type Phenotype class Number Type +.pr.e b, +, c b, pr. + 23 49 309 317 45 27 b, pr, c Total Progeny = 777 (4 pt) Give the genotypes of the parents in correct gene order and Drosophila notation. a. a. (2 pt) Fill in the Type' column indicating which phenotypic classes are parental types (P), region I crossover types (rI), region 2 crossover types (r2), or double crossover types (dco). c. (9 pts) Calculate the map distances between the genes (give answer in map units): pr-c= d. (2 pts) Calculate the value for interference for this cross.

Explanation / Answer

4. pr , c , b

pr, c

b , c

b , pr

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