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.

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.

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.

answer; i believe that the correct answer is (light);

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.