An organism has the allele frequencies of [tex]\( a = 0.4 \)[/tex] and [tex]\( b = 0.3 \)[/tex]. What is the frequency of allele [tex]\( c \)[/tex]?

A. [tex]\( c = 0.4 \)[/tex]
B. [tex]\( c = 0.0 \)[/tex]
C. [tex]\( c = 1.0 \)[/tex]
D. [tex]\( c = 0.3 \)[/tex]



Answer :

To determine the frequency of allele [tex]\( c \)[/tex], we need to remember that the sum of the allele frequencies in a population must equal 1. This is based on the principle that all possible allele frequencies must account for 100% of the population.

Given:
- Frequency of allele [tex]\( a \)[/tex] ([tex]\( \text{freq}_a \)[/tex]) = 0.4
- Frequency of allele [tex]\( b \)[/tex] ([tex]\( \text{freq}_b \)[/tex]) = 0.3

The sum of these frequencies with the frequency of allele [tex]\( c \)[/tex] ([tex]\( \text{freq}_c \)[/tex]) should be 1. Therefore, we can set up the equation:

[tex]\[ \text{freq}_a + \text{freq}_b + \text{freq}_c = 1 \][/tex]

Substituting the known frequencies into the equation:

[tex]\[ 0.4 + 0.3 + \text{freq}_c = 1 \][/tex]

Now, solve for [tex]\( \text{freq}_c \)[/tex]:

[tex]\[ 0.7 + \text{freq}_c = 1 \][/tex]

[tex]\[ \text{freq}_c = 1 - 0.7 \][/tex]

[tex]\[ \text{freq}_c = 0.3 \][/tex]

Therefore, the frequency for allele [tex]\( c \)[/tex] is [tex]\( 0.3 \)[/tex].

The correct answer is:
- [tex]\( c=0.3 \)[/tex]

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