Question

probability and heredity
vectored instruction
what is the probability of growing a tall plant from this cross?
50% (2 out of 4)
25% (1 out of 4)
75% (3 out of 4)
100% (4 out of 4)

Explanation:

Step1: Determine the number of tall - plant genotypes

In genetics, if \(T\) represents the allele for tall (dominant) and \(t\) represents the allele for short (recessive). The genotypes \(TT\) and \(Tt\) result in tall plants. From the Punnett square, there are \(TT, TT, Tt, Tt\) genotypes.

Step2: Calculate the probability

The total number of genotypes is \(n = 4\). The number of genotypes that result in tall plants is \(m=4\) (since both \(TT\) (2 cases) and \(Tt\) (2 cases) lead to tall plants). The probability \(P=\frac{m}{n}\). Substituting \(m = 4\) and \(n = 4\), we get \(P=\frac{4}{4}=1\) or \(100\%\)

Answer:

100% (4 out of 4)