CH.12

Which of the following is not a part of Mendel's five element model?

If an allele is present it will be expressed.

The F1 plants from the previous question are allowed to self-fertilize. The phenotypic ratio for the F2 should be?

3 purple: 1 white

What property distinguished Mendel's investigation from previous studies?

Mendel quantified his results

You discover a new variety of plant with color varieties of purple and white. When you intercross these, the F1 is a lighter purple. You consider that this may be an example of blending and self-cross the F1. If Mendel is correct, what would predict for F2?

1 purple: 2 light purple: 1 white

What is the probability of obtaining an individual with the genotype CC from a cross between two individuals with the genotype CC and Cc?

1/2

What is the probability of obtaining and individual with the genotype bb from a cross between two individual witht the genotype Bb?

1/4

A dihybrid cross between a plant with long smooth leaves and a plant with short hairy leaves produces a long smooth F1. If this F1 is allowed to self-cross to produce and F2 what would you predict for the ratio of F2 phenotypes?

9 long smooth: 3 long hairy: 3 short smooth: 1 short hairy

Mendel's model assumes that each trait is determined by a single factor with alternate forms. We now know that this is too simplistic and that?

A single gene can affect more than one trait, and traits may be affected by more than one gene

The F1 generation of the monohybrid cross purple (PP) x white (pp) flower pea plants should?

All have purple flowers

Consider a long smooth F2 plant from the previous question. this plants genotype?

Can only be inferred by another cross

An organisms __ is/are determined by it's __?

Phenotype; genotype

Phenotypes like height in humans, which show a continuous distribution, are usually the result of?

The action of multiple genes on a single phenotype