Answer: B. 1920
Explanation:
To calculate the frequency of heterozygotes among 4000 individuals, we use the Hardy-Weinberg equation:
2pq = frequency of heterozygotes
Given that the frequency of the autosomal recessive gene is 0.4, we can substitute this value into the equation:
2pq = 2 * (0.4) * (1 - 0.4) = 2 * 0.4 * 0.6 = 0.48
The value of 2pq represents the frequency of heterozygotes in the population.
Now, to find the number of heterozygotes in the progeny among 4000 individuals, we multiply the frequency (0.48) by the total number of individuals (4000):
0.48 * 4000 = 1920
Therefore, the frequency of heterozygotes in the progeny among 4000 individuals is 1920