Final answer:
By applying Mendel's 3:1 ratio of dominance to recessiveness, for the 650 inflated-pod plants observed in the F2 generation, we expect 217 constricted-pod plants. Option E.
Step-by-step explanation:
To investigate the pea pod texture trait with constricted or inflated pods following Mendelian genetics, we consider that inflated pods are dominant.
Given that 650 inflated-pod plants are observed in the F2 generation, we can apply the expected 3:1 Mendelian ratio of dominant to recessive phenotypes to predict the number of constricted-pod plants.
In a Mendelian 3:1 ratio, for every 3 plants with the dominant (inflated pods) phenotype, there is 1 with the recessive (constricted pods) phenotype.
So, if there are 650 inflated
We would expect a total of 650 + (650 / 3) = 650 + 216.67
We round to 217, giving us a total of 867 plants
To find the number of constricted-pod plants
We subtract the number of inflated-pod plants from the total:
867 - 650 = 217 constricted-pod plants.
Hence, the right answer is option E. 217.
The complete question is:
Consider a cross to investigate the pea pod ure trait, involving constricted or inflated pods. Mendel found that the traits behave according to a dominant/recessive pattern in which inflated pods were dominant. If you performed this cross and obtained 650 inflated-pod plants in the F2 generation bred from true-breeding stock, approximately how many constricted-pod plants would you expect to have?
a) 162
b) 65
c) 488
d) 325
e) 217