Question

What is the reason for the smaller probability of the double crossover event compared to the single crossover events between two loci?

1) The probability of the double crossover event is the sum of the individual probabilities of single crossovers between two loci.
2) The probability of the double crossover event is equal to the product of the individual probabilities of single crossovers between two loci.
3) The probability of the double crossover event is greater than the individual probabilities of single crossovers between two loci.
4) The probability of the double crossover event is smaller than the individual probabilities of single crossovers between two loci.

Answer 1

The reason for the smaller probability of a double crossover event compared to single crossover events between two loci is that 4) the probability of a double crossover event is smaller than the individual probabilities of single crossovers between the two loci.

Step-by-step explanation:

The reason for the smaller probability of a double crossover event compared to single crossover events between two loci is that the probability of a double crossover event is smaller than the individual probabilities of single crossovers between the two loci.

When two genes are located in close proximity on the same chromosome, their alleles are more likely to be transmitted together through meiosis without undergoing a crossover event. However, as the distance between two linked genes increases, the probability of crossovers between them also increases.

The further apart two linked genes are on a chromosome, the more likely crossovers are to occur, resulting in non-parental genotypes. This increases the chances of genetic recombination and the production of offspring with different combinations of alleles.