Question

1. A heterozygous tall pea plant is crossed with a short plant. The probability that an F1 plant will be tall is (1 point)
25%.
50%.
75%.
100%.

Answer 1

You have to know the dominance relationship between the short and tall alleles. Specifically, is tall dominant to short or vice versa? So not enough info has been provided to help us help you.

Answer 2

@blues

Gregor Mendel did find that tallness is a dominant trait, in pea plants.

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@iloveeyouu98

Do you know how to make a Punnett Square?

The word "heterozygous" means that the genotype has one capital letter, and one lowercase letter.

And since tallness is dominant,
a capital T stands for Tall.

A lowercase t stands for short.

So, a heterozygous, tall pea plant would have the genotype (T t),
you see?

What we have to do is cross a heterozygous tall plant (T t)
with a short plant.

We know the genotype of the heterozygous tall plant. (T t)

But what about the genotype of the short plant?

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There are 2 rules that we need to know here:

#1. The capital letter always matters more than the lowercase letter.

If a plant has a capital T in its genotype,
then it will be tall.

It doesn't matter if there's a lowercase letter t in there.

#2. Since a lowercase t stands for short,
the only way that the plant would be short is if it ONLY had lowercase letters, in its genotype.
NO capital letters.

So, that means that a short plant's genotype would have to be (t t).

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Okay, so now, we know the genotypes of both plants!

(T t) and (t t).

Now, all we have to do is make a Punnett Square, using those two genotypes,
so that we can find the answer to our question.