When two loci are very close together on a chromosome,
A) they are linked.
B) a crossing-over event between them is less likely than when two loci are far apart.
C) they can blend into a single gene.
D) both a and b are correct.

Question

Quizplus · Accepted Answer

When two loci are very close together on a chromosome, they tend to be physically linked and inherited together. As a result, a crossing-over event between them is less likely than when two loci are far apart. Additionally, if the loci are extremely close, they may appear as a single gene or operon. Therefore, both option A and B are correct.

When Two Loci Are Very Close Together on a Chromosome