STEVE

Question 1

In Mendel’s time, most people believed that

Answer 1

C

Question 2

Which of the following statements is true?

Answer 2

A

Question 3

In his experiments with plants, Mendel removed which part of the plant to prevent unwanted fertilizations?

Answer 3

D

Question 4

A locus is

Answer 4

D

Question 5

Mendel’s study of genetics differed from those of his contemporaries because he

Answer 5

C

Question 6

Which of the following descriptions of Mendel is incorrect?

Answer 6

A

Question 7

Which organism did Mendel use to work out the laws of segregation and independent assortment?

Answer 7

C

Question 8

Various forms of a gene at a given locus are called

Answer 8

B

Question 9

If R is dominant to r, the offspring of the cross of RR with rr will

Answer 9

B

Question 10

Mendel found that pea plants expressing a recessive trait

Answer 10

A

Question 11

Hybrid organisms produced from a cross between two pure-breeding organisms belong to which generation?

Answer 11

D

Question 12

If short hair (L) is dominant to long hair (l), animals LL and Ll have the same

Answer 12

C

Question 13

According to Mendel, what kind of genes “disappear” in F1 pea plants?

Answer 13

C

Question 14

. If tall (D) is dominant to dwarf (d), and two homozygous varieties DD and dd are crossed, then what kind of offspring will be produced?

Answer 14

B

Question 15

The F2 phenotypic ratio of a monohybrid cross is

Answer 15

E

Question 16

If all offspring of a cross have the genotype Aa, the parents of the crosses would most likely be

Answer 16

A

Question 17

Short hair (L) is dominant to long hair (l). If a short-haired animal of unknown origin is crossed with a long-haired animal and they produce one long-haired and one short-haired offspring, this would indicate that

Answer 17

B

Question 18

For Mendel’s explanation of inheritance to be correct,

Answer 18

B

Question 19

The results of a testcross reveal that all offspring resemble the parent being tested. That parent necessarily is

Answer 19

C

Question 20

Some dogs have erect ears; others have drooping ears. Some dogs bark when following a scent; others are silent. Erect ears and barking are due to dominant alleles located on different chromosomes. A dog homozygous for both dominant traits is mated to a droopy-eared, silent follower. The phenotypic ratio expected in the F1 generation is

Answer 20

B

Question 21

Some dogs have erect ears; others have drooping ears. Some dogs bark when following a scent; others are silent. Erect ears and barking are due to dominant alleles located on different chromosomes. If two dihybrids are crossed

Answer 21

B

Question 22

A testcross involves

Answer 22

E

Question 23

For monohybrid experiments, a testcross could result in which of the following ratios?

Answer 23

A

Question 24

If all the offspring of a testcross are alike and resemble the organism being tested, then that parent is

Answer 24

A

Question 25

Mendel’s principle of independent assortment states that

Answer 25

D

Question 26

An individual with a genetic makeup of aa BB is said to be

Answer 26

A

Question 27

A dihybrid cross of two contrasting pure-breeding organisms

Answer 27

C

Question 28

Individuals with the genotype Gg Hh Ii Jj will produce how many different kinds of gametes?

Answer 28

E

Question 29

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If a red spotted male was crossed with a black solid female and all the offspring from several crosses expressed only the dominant traits, the genotype of the female

Answer 29

A

Question 30

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If two black solid dogs were crossed several times and the total offspring were eighteen black solid and five black spotted puppies, the genotypes of the parents would most likely be

Answer 30

D

Question 31

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If two dihybrids (Bb Ss) were crossed, what fraction of the black solid offspring would be homozygous?

Answer 31

C