In humans, brown hair is dominant over blonde hair. Also in humans, detached earlobes are dominant over attached earlobes. If a male that is heterozygous for both traits has children with a female that is heterozygous for both traits, their offspring’s phenotypes would be represented by which of the following ratios: *

A)4:4:4:4

B)9:3:3:1

C)16:0

D)3:1

B) 9:3:3:1

Explanation:

A punnet square can be described as a diagram in which the outcomes of a cross between parent carrying certain traits can be studied.

A cross in which only one trait is studied will be termed as a monohybrid cross. For example, making a cross for just hair colour.

A cross in which two traits are being studied at a time is termed as a dihybrid cross. For example, studying the hair color and the pattern of earlobes in a single punnet square.

The pnnet square for the scenario discussed in the question can be made as follws:

              BE               Be                bE                 be

BE     BBEE         BBEe             BbEE             BbEe

Be     BBEe         BBee             BbEe             Bbee

bE     BbEE         BbEe              bbEE             bbEe

be     BbEe        Bbee               bbEe               bbee

The results of the cross show that :

9/16 show probability for having brown hair and detached earlobes. 3/16 have the probability of having brown hair and attached earlobes. 3/16 have the probability of having blonde hair and detached earlobes. 1/16 have the probability of having blonde hair and attached earlobes.

Even as constructive forces are creating landforms on Earth, destructive forces are wearing them down. Weathering and erosion are two forces that are constantly acting to reshape the land. Weathering is the breaking down of the materials of Earth's crust into smaller pieces.