Deck 3: Basic Principles of Heredity

Question 1

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

A)segregation.
B)dominance.
C)recessive.
D)Mendel.

Answer 1

B
dominance .

Question 2

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

A)The F1 generation had a blended phenotype of the two parental phenotypes.
B)Both parental phenotypes reappeared in the F2 generation.
C)Each F1 plant had a different phenotype.
D)The F1 plants did not have two alleles.
E)none of the above

Answer 2

B
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

A)partial dominance.
B)incomplete dominance.
C)the product rule.
D)the concept of dominance.

Answer 3

B
i ncomplete dominance .

Question 4

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

A)AA
B)Aa
C)aa
D)The test-crossed individual is unknown.

Question 5

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

A)green seeds.
B)yellow seeds.
C)some yellow seeds and some green seeds.
D)a color in between green and yellow.
E)no seeds.

Question 6

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

A)1/8
B)1/4
C)1/2
D)2/3
E)3/4

Question 7

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

A)It produces few progeny.
B)It has characteristics that are clear and easy to identify.
C)It requires extensive care.
D)It requires several seasons to complete a generation.
E)all of the above

Question 8

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

A)dependent upon how different alleles assort.
B)independent of how different alleles assort.
C)to prevent two mutant alleles from occupying the same seed.
D)none of the above

Question 9

Alternate forms of a gene are called

A)loci.
B)phenotypes.
C)alleles.
D)genotypes.
E)heterozygotes.

Question 10

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

A)0/4
B)1/4
C)2/4
D)3/4
E)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?

A)The disease must be X-linked.
B)The disease must be Y-linked.
C)The disease is not X-linked.
D)We do not have enough data to conclude anything.

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?

A)The trait is X-linked.
B)The trait is autosomal dominant.
C)The trait is autosomal recessive.
D)We do not have enough data to conclude anything.

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?
a.There is a 99% chance that you did the experiment correctly.
b.There is a 99% chance that the difference between expected and observed progeny is due to something other than chance.
c.You probably made an error in calculating your expected progeny.
d.There is a 99% chance that the difference between expected and observed progeny is due to chance.