13. Mendelian Genetics

Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division?

Mendel's law of independent assortment has its basis in which of the following events of meiosis I?

According to Mendel's Law of Segregation, which of the following is a true statement?

The genes for the traits that Mendel worked with are either all located on different chromosomes or behave as if they were. How did this help Mendel recognize the principle of independent assortment?

a. Otherwise, his dihybrid crosses would not have produced a 9 : 3 : 3 : 1 ratio of F2 phenotypes.

b. The occurrence of individuals with unexpected phenotypes led him to the discovery of recombination.

c. It led him to the realization that the behavior of chromosomes during meiosis explained his results.

d. It meant that the alleles involved were either dominant or recessive, which gave 3 : 1 ratios in the F1 generation.

Suppose you are heterozygous for two genes that are located on different chromosomes. You carry alleles A and a for one gene and alleles B and b for the other. Be sure to list all the genetically different gametes that could form and indicate how frequently each type should be observed.

Suppose you are heterozygous for two genes that are located on different chromosomes. You carry alleles A and a for one gene and alleles B and b for the other. On the diagram, identify the events responsible for the principle of segregation and the principle of independent assortment.