only answer if you truly know genetics! You and your partner are testing the hyp
ID: 59364 • Letter: O
Question
only answer if you truly know genetics!
You and your partner are testing the hypothesis that flower color in the charming little perennial Foedus molisium is controlled by two alleles at a single gene. You have two true-breeding lines, one with red flowers and the other with white flowers. Given your hypothesis, what phenotype(s) and proportions do you expect to see in the progeny of a cross between red- and white-flowering plants, assuming red is dominant to white in this species? If you cross these F1 progeny inter se, what phenotype(s) and proportions do you expect to see in the F2? Your partner scores 100 of these F2 plants, and observes 80 of them have red flowers and 20 of them have white flowers. Do these data support your hypothesis? (Show your work.) You. being a much more diligent researcher than your partner, score 1000 F2 plants from exactly the same cross, and you see exactly the same ratio as your partner did: 800 of the plants have red flowers and 200 have white flowers. Do your results support your hypothesis? (Show your work.) Discuss your answers to parts c. and d.Explanation / Answer
a).
Assume allele for Red flowers = R
allele for white flowers = r
Red is dominant over white
P - RR x rr
F1 - Rr Rr Rr Rr ---- all red flowers
b)
Crossing the F1 progeny inter se, we would obtain phenotypes in the ratio 3:1, and genotypes in the ratio 1:2:1
Rr x Rr
RR Rr Rr rr ----- 3 red flowers and 1 flower
rr - white flowers
RR, Rr - red flowers
c)
Given, of the 100 flowers, 80 are red and 20 are white. This data supports our hypothesis, as it is near to the ratio 3:1.
d)
Of the 1000 F2 plants, 800 are red and 200 are white. Even this data is similar to the above data. Therefore, it supports our hypothesis.
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