Question

Which of the following statements is correct in describing the terms monohybrid cross and dihybrid cross?A) A monohybrid cross is performed for one generation, whereas a dihybrid cross is performed for two generations.B) A monohybrid cross results in a 9:3:3:1 ratio, whereas a dihybrid cross gives a 3:1 ratio.C) A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents.D) A dihybrid cross involves organisms that are heterozygous for two characters that are being studied, and a monohybrid cross involves organisms that are heterozygous for only one character being studied.

Answer 1

D) A dihybrid cross involves organisms that are heterozygous for two characters that are being studied, and a monohybrid cross involves organisms that are heterozygous for only one character being studied.

Step-by-step explanation:

When you say monohybrid, this means that the organisms are heterozygous for 1 trait only. Dihybrid means that the organisms are heterozygous for 2 traits. This alone would make D correct.

You can perform both in one generation so you can take A out of the list.

A monohybrid cross would result in a 2x2 Punnett, so the results would be 3:1 and in a dihybrid cross, the Punnet is a 4 x 4 so the results would be 9:3:3:1. Since option B, is interchanged, then you can cross that out.

As or C, a monohybrid and dihybrid refers to the traits, not the number of parents.