Question

in pea plants, tall plant height is dominant over short plant height. if there are 200 short plants in the f2 generation from a cross that followed mendel’s methods, about how many plants will be tall in that generation?
○ 200
○ 300
○ 600
○ 1,000

Explanation:

Step1: Recall Mendel's ratio

In Mendel's monohybrid cross for dominant - recessive traits, the phenotypic ratio of the \(F_2\) generation is \(3:1\) (tall:short). This means that for every 1 short plant, there are 3 tall plants.

Step2: Calculate the number of tall plants

Let the number of tall plants be \(x\). We know that the ratio of tall to short plants is \(\frac{x}{200}=\frac{3}{1}\). Cross - multiplying gives us \(x = 3\times200=600\).

Answer:

600