In the testcross shown, the three linked genes are autosomal; their order is unknown. Using the information given, compl

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In The Testcross Shown The Three Linked Genes Are Autosomal Their Order Is Unknown Using The Information Given Compl 1 (346.41 KiB) Viewed 28 times

In the testcross shown, the three linked genes are autosomal; their order is unknown. Using the information given, complete the sentences using the blue boxes. (Each box can be used only once, and not all the boxes will be used.) vg b pr/vg b pr x vg+ b* pr+/vg+ b* pr+ P F₁ (all identical) Testcross vg b pr/vg+ b* pr+ x ♂vg b pr/vg b pr Testcross progeny recombinants total of the parental classes 131 + 118 +13+9 vg b* and vg+ b 5.9 total of all progeny b pr 18.7 1779 vg b pr 1654 vg+b+ pr+ 252 vg+ b pr 241 vg b* pr+ 131 118 13 9 4197 homozygous vg parental double crossovers 252 +241 +13 +9 b pr* and b* pr trihybrid vg pr* and vg+ pr vg, b, and pr 6.4 vg b pr/vg+ b* pr+ frequencies vg+ b pr vg b* pr vg b pr vg+ b* pr ـالـهـا Parental combinations for all three genes Recombinants for vg relative to parental combinations for band pr Recombinants for b relative to parental combinations for vg and pr Recombinants for pr relative to parental combinations for vg and b The testcross is between a parental female and a male who is three loci. All testcross progeny inherited a chromosome with shown), and one of eight possible combinations of alleles from the mother. The first two classes of progeny are the most abundant because they are remaining progeny are six types of alleles from the father (not that fall into three reciprocal pairs. The genetic distance between and order of the genes can be deduced from the of the recombinant classes. The progeny with a recombination between vg and pr are distance between vg and pris (. recessive at all Select any two of the three genes to begin. For example, recombination events that occurred between vg and b during meiosis in the mother resulted in the progeny. (Ignore pr for now.) The genetic distance between vg and b is the sum of all vg b* and vg* b progeny divided by the and multiplied by 100. This is (252 +241 + 131 +118)/4197 X 100 = 17.7 m.u. _)/4197 X 100 12.3 m.u. The progeny with a recombination between b and pr are between b and pris m.u. It is apparent that vg and b are the farthest apart, so . The The genetic The genetic distance must be in the middle. The calculation of genetic distance between vg and b above is inaccurate. The last two classes of progeny are the result of two crossovers occurring between vg and b and are called The double crossovers are added twice to the calculation. The corrected genetic distance between vg and bis (252 +241 + 131 + 118 +13+9+13 +9)/4197 X 100 =