Two genes of a flower, one controlling blue (b) versus white (w) petals and the other controlling round (r) versus oval (o) stamens, are linked and are 10 map units apart. you cross a homozygous blue-oval plant with a homozygous white-round plant. the resulting f1 progeny are crossed with homozygous white-oval plants, and 1,000 f2 progeny are obtained. how many f2 plants of each of the four phenotypes do you expect?

The offspring genotype in F2 generation is –

bwoo: wbor: worw: wwoo

So its ratio is  

4:4:4:4

1:1:1:1

Thus number of individual in each genotype group out of 1000 is 250

Explanation:

Given -

homozygous blue-oval plant is crossed with homozygous white-round plant

Genotype of homozygous blue-oval plant - bboo

Genotype of homozygous white-round plant -wwrr

The ofspring produced in F1 generation will have genotype - bowr

In F2 generation, "bowr" is crossed with homozygous white-oval plants "wwoo"

The following offspring are produced -

bwor – bo, br, wr, wo

wwoo- wo, wo, wo, wo

bo        br        wr       wo

wobwoowborworwwwoo

wobwoowborworwwwoo

wobwoowborworwwwoo

wobwoowborworwwwoo

The offspring genotype is –

bwoo: wbor: worw: wwoo

So its ratio is  

4:4:4:4

1:1:1:1

Thus number of individual in each genotype group out of 1000 is 250

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

videntify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.