Hopefully that wasn’t too ridiculously confusing… Especially since I’m just going to say more things here!

First, heterozygous, in case it wasn’t obvious, means that the alleles for a gene are different. The example given was Ff.  Capital letters are used to represent dominant traits, as a rule.

Second, alleles are like… the color blue for fur. There will be a hair color gene, but the allele is what specifies that it’s blue. That’s the gist.

Third, I marked the offspring with blue fur or pink eyes in the table, as you may have noticed. This actually shows an important relationship. Mendelian tables can be used to predict offspring characteristics. The results of the two heterozygous parents in this example were 9 chinchillas with white fur and black eyes, 3 with blue fur and black eyes, 3 with white fur and pink eyes, and 1 with blue fur and pink eyes.  Thus, the ratio for the offspring of two parents who are heterozygous in two traits will be 9:3:3:1.

In the example, Chinny’s white fur was dominant over the blue, but that was so that I wouldn’t confuse anyone further. The “dominant” and “recessive” concept is sort of a misconception. The dominant alleles don’t NECESSARILY mask the traits genetically. In a lot of cases, the properties are just physically domineering. For instance, white fur would most likely have actually been the recessive trait, because it’s probably just a lack of pigment, so the blue would show. Since chinchillas aren’t usually blue, I went ahead and declared it recessive.