Mader's Concepts in Biology, First Edition

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Sylvia S. Mader

Chapter 9

Question 1

Many of the different types of dogs available today are the result of which of the following?

A. multiple alleles

B. polygenic inheritance

C. incomplete dominance

D. inbreeding

E. codominance

Question 2

Charles Darwin is sometimes known for developing the fundamental laws of heredity.

A. true

B false

Question 3

Which of the following was not a factor in choosing the pea plant to perform genetic experiments?

A. it has a short generation time

B. it produces many offspring

C. the flower is not enclosed in petals

D. it is easy to culture

E. they can be easily pollinated

Question 4

If you wanted to study the male portion of a flower, which of the following structures would you be interested in?

A. the stamen

B. the carpel

C. the stigma

D. the style

E. the ovary

Question 5

Which of the following parts of the flower produce the egg?

A. the stamen

B. the anther

C. the filament

D. the pollen

E. the carpel

Question 6

If a biologist wanted to cross-fertilize two flowers, which of the following steps must be taken?

A. transfer the egg from one plant to the otherB. transfer the ovule from one plant to the otherC. transfer pollen from one plant to the otherD. transfer a pea from one plant to the otherE. transfer the stigma from one plant to the

other

Question 7

Which of the following was not a trait studied by Mendel in peas?

A. stem length

B. seed size

C. flower color

D. pod shape

E. seed color

Question 8

In a mendelian monohybrid cross, the _______ generation is always completely heterozygous.

A. F1

B. F2

C. F3

D. P

E. P2

Question 9

In which kind of cross would you expect to find a ratio of 3:1 among the F2 offspring?

A. test cross

B. dihybrid cross

C. monohybrid cross

D. phenotypic cross

E. genotypic cross

Question 10

Mendel’s law of segregation implies that the two members of an allelic pair:

A. are distributed to separate gametes

B. are distributed to the same gamete

C. are assorted dependently

D. are segregated pair wise

E. must always code for the identical trait or feature

Question 11

Which is not true according to Mendel's law of segregation?

A. each individual contains two factors for each trait

B. one factor must be dominant and one factor recessive in each individual

C. factors separate from each other during gamete formation

D. each gamete contains one copy of each factor

E. fertilization restores the presence of two factors

Question 12

What are alleles?

A. genes for different traits, such as hair color and eye color

B. dominant forms of a kind of characteristic carried by genes

C. the locations of genes on chromosomes

D. alternative forms of a gene for a single trait, such as blue eyes and brown eyes

E. recessive forms of a kind of characteristic carried by genes

Question 13

Which of the following terms is represented by word descriptions, such as brown or tall?

A. phenotype

B. genotype

C. allele

D. homozygous

E. dominance

Question 14

In humans, brown eyes (B) are dominant over blue eyes (b). A brown-eyed woman who has a blue-eyed child would have the genotype:

A. bbB. BbC. BBD. BBBE. BbBb

Question 15

When an organism has two identical alleles for a trait we would refer to this condition as:

A. phenotype

B. genotype

C. homozygous

D. gene locus

E. heterozygous

Question 16

When an organism has two different alleles for a particular trait, which of the following terms best describes this condition?

A. phenotype

B. genotype

C. homozygous

D. gene locus

E. heterozygous

Question 17

Which of the following terms would be used for an allele which can mask the expression of another allele?

A. dominant

B. phenotype

C. recessive

D. genotype

E. locus

Question 18

If a homozygous brown-eyed woman mates with a homozygous blue-eyed man, what would be the chances of producing a blue-eyed child?

A. 100%B. 75%C. 50%D. 25%E. 0%

Question 19

A woman who can roll her tongue (presumably dominant) is married to a man who cannot. Two of their four children can roll their tongues and two cannot. What is the genotype of the parents?

A. woman Aa, man Aa

B. woman AA, man aa

C. woman Aa, man AA

D. woman Aa, man aa

E. cannot be determined

Question 20

If an organism shows a recessive phenotype, such as short pea plants, it can be:

A. either TT or Tt

B. either TT or tt

C. only tt

D. only TT

E. only Tt