What could be some weakness with using a test cross to determine Fred’s genotype?

Test-cross is often used to determine the genotype of parent that is dominant as we cannot determine that the dominant parent is homozygous or heterozygous for the trait just be looking at it.

In a test-cross, the dominant trait organism will be crossed with a recessive type organism. The results will predict the genotype of the dominant parent.

Some of the drawbacks of the test cross are:

a) It might be difficult to find a recessive type of the particular trait.

b) The result prediction can take a lot of time. This is because enough offspring have to be developed to predict the result which will take time.

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain