shape outline Replace Styles. Q Shape Effects select. the gene c+ is located on

Question

shape outline Replace Styles. Q Shape Effects select. the gene c+ is located on chromosome 2 of the D. melanogastergenome. Four other genes, d+et,ftg+, were map in relationship to gene c+ by performing two, three gene test crosses, the results of which are shown in the table below. partial genetic map of chromosome 2 Add e, d, f and g to the map chromosome 2 50mu 50mu 50mu phenotype results phenotype results from test offspring cross 1 offspring testcross of test of test cross 1 cross 2 de 2000 1000 C d ee+ c+ d+ e+ 3 c de 2 1020 c+ fg 2200 C+ d e+ c d+ e

Explanation / Answer

Test cross 1

C+ d e and C d+ e+ are parental strand shows high value.

recombinant frequency of C+ e= 3+2+700+650 = 1355/5895 = 22% or 22mu

recombinant frequency of C+ d = 3 + 2+210+130 = 345/5895 = 5.8mu

recombinant frequency of d e = 700+650+210+130 = 1690/5895 = 28mu

Test cross 2 C+ f+ g+, c f g, C f+ g+, c+ f g, shows 1:1:1:1. So here c is present in different chromosomes compare to f and g.

recombinant frequency of f g =50+45+55+45 = 195/4145 = 4mu. This data not be useful it present in different chromosome.

Result   a+---------------d+-------c+-------------e+------------h+-------------

                   44.2mu    5.8mu      22mu         28mu

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.