Question

outline the following information on Mendel’s Dihybrid Crosses

1.Previous knowledge that lead to the formation of the hypothesis/question

2.Hypothesis/Question

3.Prediction(s)

4.Experimental Design (test variables, controls, inductive reasoning, deductive reasoning)

5.Results

6.How did the results affect the original hypothesis and/or state of biological knowledge?

Answer 1

1. Mendel had an opinion that single feature associated with a single gene is inherited. In case of two features associated with two genes he was confused whether the genes are inherited independently or they stick together as a unit. To remove this doubt Mendel performed the dihybrid cross.

2. Hypothesis - If two pairs of characters are involved will they transmitted together or independently.

3. Prediction was the law of independent assortment which is during gamete formation assortment of alleles of one gene is independent of assortment of alleles of another gene.

4. Experimental design:

Mendel crossed two pea plants one with yellow, round seeds and the other with green, wrinkled seeds.

The offsprings were yellow with round, yellow with wrinkled, green with round and green with wrinkled seeds. The phenotypic ratio was 9:3:3:1 If they did'nt follow independent assortment then the ratio would 3:1 which is not true as we are getting several types of seeds on crossing.