e the types of gametes the F1’s may be expected to form and the proportion of each. c. What are the expected genotypic ratio, and phenotypic ratio of green to red if: i. the F1’s are intercrossed? ii. the F1’s are crossed with red plants? d. If the G locus were 50 or more map units from the centromere, what types and proportions of gametes would the F1 be expected to produce? Derive the expected F2 genotypic and phenotypic ratios.
In an autotetraploid Chinese primrose (Primula sinensis L.), the gene controlling stigma color is very near
the centromere of the chromosome carrying it. The allele G for green stigma is dominant to g for red
stigmas. A homozygous green autotetraploid strain is crossed with a homozygous red autotetraploid
strain. Show all solutions and label solutions and final answers properly.
a. What is the genotype of the F1?
b. Derive the types of gametes the F1’s may be expected to form and the proportion of each.
c. What are the expected genotypic ratio, and
i. the F1’s are intercrossed?
ii. the F1’s are crossed with red plants?
d. If the G locus were 50 or more map units from the centromere, what types and proportions of
gametes would the F1 be expected to produce? Derive the expected F2 genotypic and phenotypic
ratios.
Please answer letter d only.
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