Question

Tall pea plants are dominant over short pea plants. 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

Answer 1

600

Step-by-step explanation:

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Answer 2

There will be 600 tall plants in that generation.

Step-by-step explanation:

In Mendel’s cross the selected parents are a tall pea plant and a short pea plant. Both the parents are homozygous. The recessive trait is short. Letter T represents tall and t represents short. Hence the phenotype TT is homozygous dominant and tt is homozygous recessive.

The genotype Tt represents tall since T is dominant over t. Mendel’s cross can be represented as

`Tall * Short`

`TT * tt`

F1 generation Tt Tt Tt Tt

F2 generation TT Tt Tt tt

In the F1 generation all the plants are tall and in the F2 generation 3/4 plants are tall and1/4 plants are short.

In the question it is given that 200 plants are short in the F2 generation. Let total number of offspring in the F2 generation is x.

`1/4 * x=200`

x=800

number of tall plants =
`3/4 * x`

`= 3/4 * 800 =600`

Hence there will be 600 tall plants in the F2 generation.