Question 1

An organism has the genotype Rr and the phenotype R.This is known as the concept of

Accepted Answer

dominance .

Question 2

In Mendel's pea plants,how did he know that each F1 generation contained two alleles encoding different characteristics?

Accepted Answer

Both parental phenotypes reappeared in the F2 generation.

Question 3

The progeny of a cross between a pure white chicken and a pure black chicken are all gray.This is an example of

Accepted Answer

i ncomplete dominance .

Question 4

If an individual of genotype Aa is test-crossed,what is the genotype of the test-crossed individual?

Accepted Answer

aa

Question 5

When Mendel crossed two pure pea plants,one with green seeds and one with yellow seeds,the F1 progeny had

Accepted Answer

green seeds .

Question 6

What is the probability that in the cross Aa Bb × aa Bb the progeny will be aa BB?

Accepted Answer

1/8

Question 7

Why was the pea plant an ideal plant for Mendel to use?

Accepted Answer

It h as characteristics that are clear and easy to identify .

Question 8

According to Mendel's second law,during meiosis the pea-plant genes for seed color and texture assort

Accepted Answer

i ndependent of how different alleles assort .

Question 9

Alternate forms of a gene are called

Accepted Answer

alleles .

Question 10

If T tallis dominant to t short),then what proportion of the progeny will be tall in the following cross: Tt × TT?

Accepted Answer

4/4

Question 11

If you were looking at a pedigree and noticed that a particular disease COULD be inherited from father to sons,what can you conclude?

Accepted Answer

The disease is not X-linked.

Question 12

You are studying anemia.While looking at a pedigree you notice that the anemia phenotype is not present in a set of parents,but 1 out of their 5 children has anemia.What can you conclude about anemia?

Accepted Answer

The trait is autosomal recessive .

Question 13

In an experiment you do a chi-square test comparing observed and expected progeny.Your calculated chi square is 0.99.What does this mean?

Accepted Answer

A chi-square value of 0.99 with a degree of freedom of 1 is not significant at a level of 0.05. Therefore, there is a 99% chance that the difference between expected and observed progeny is due to chance.

Quiz 3: Basic Principles of Heredity