Q.Select the correct statement from the ones given below with respect to dihybrid cross

Step 1. Independent assortment, which produces the full range of gamete combinations in a dihybrid cross, assumes the two genes sit on different chromosomes (or are far enough apart to assort almost independently).

Step 2. Genes that instead sit close together on the same chromosome tend to be inherited as a single physical unit, because crossing over between them during meiosis is rare when they are tightly linked - so very few gametes carry a new, recombinant combination of alleles.

Step 3. This makes option (a) correct and directly contradicts option (b), which wrongly claims tightly linked genes show higher combinations. …

Recall that linkage distance is inversely related to recombination frequency: tig …

• Assuming linkage has no effect on gamete combinations, treating linked genes as if they still assorted independently. …