What is the order of genes on the chromosome?22. In the tubular flowers of foxgloves, wild-typecoloration is red while a mutation called whiteproduces white flowers. Another mutation, calledpeloria, causes the flowers at the apex of the stemto be huge. Yet another mutation, called dwarf,affects stem length. You cross a white-floweredplant (otherwise phenotypically wild type) to aplant that is dwarf and peloria but has wild-typered flower color. All of the F1 plants are tall withwhite, normal-sized flowers. You cross an F1 plantback to the dwarf and peloria parent, and you seethe 543 progeny shown in the chart. (Only mutanttraits are noted.)dwarf, peloria 172white 162dwarf, peloria, white 56wild type 48dwarf, white 51peloria 43dwarf 6peloria, white 5a. Which alleles are dominant?b. What were the genotypes of the parents in the original cross?c. Draw a map showing the linkage relationships ofthese three loci.d. Do the data provide evidence for interference? Ifso, calculate the coefficient of coincidence and theinterference value.
What is the order of genes on the chromosome?
22. In the tubular flowers of foxgloves, wild-type
coloration is red while a mutation called white
produces white flowers. Another mutation, called
peloria, causes the flowers at the apex of the stem
to be huge. Yet another mutation, called dwarf,
affects stem length. You cross a white-flowered
plant (otherwise
plant that is dwarf and peloria but has wild-type
red flower color. All of the F1 plants are tall with
white, normal-sized flowers. You cross an F1 plant
back to the dwarf and peloria parent, and you see
the 543 progeny shown in the chart. (Only mutant
traits are noted.)
dwarf, peloria 172
white 162
dwarf, peloria, white 56
wild type 48
dwarf, white 51
peloria 43
dwarf 6
peloria, white 5
a. Which alleles are dominant?
b. What were the genotypes of the parents in the original cross?
c. Draw a map showing the linkage relationships of
these three loci.
d. Do the data provide evidence for interference? If
so, calculate the coefficient of coincidence and the
interference value.
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