Question

In unordered tetrad analyses of two linked loci, a nonparental ditype is an indication of

a. Four-chromatid double crossover.

b. Two-chromatid double crossover.

c. No crossovers.

d. Three-chromatid double crossover.

Answer 1

In unordered tetrad analyses, a nonparental ditype indicates two-chromatid double crossover.

Step-by-step explanation:

In unordered tetrad analyses of two linked loci, a nonparental ditype is an indication of two-chromatid double crossover. Nonparental ditypes are the result of recombination during meiosis, where nonsister chromatids exchange genetic material. This exchange occurs at chiasmata, which are formed during prophase I of meiosis.