In Drasophila the recessive alleles for brown and scarlet eye(two unlinked genes
ID: 59146 • Letter: I
Question
In Drasophila the recessive alleles for brown and scarlet eye(two unlinked genes) interact so that the double recessive homozygote show white eyes. If a pure-breeding brown fly is crossed to a pure-breeding brown fly is crossed to a pure-breeding scarlet fly what proportion of the F_2 will be white? The maize genes sh are bz are linked and 30 map unit apart. If a plant sh' bz/sh bz' is self-fertilized what proportion of the progency will be homozygous whildtype for both genes? What does a bacterial transposon look like?Explanation / Answer
15. option a 1/16 will be white if pure breeding is done between the scarlet and purple , the F 2 generation .
16 . option B 0.15 mapunits
17. option D , insertion sequences flanked by the inverted repeats .
19. option B variable expressivity .
20. option a , yes they can if they are hetrozygous with AO blood group.
21 Option b ,plum eye is a lethal allele .
option 18 and 23 i am not sure of answer ;
18 . Option c , three
19. option d ,75