Genetics

Front 1

Genetics is the branch of the biological sciences that deals with both heredity and variation.

Back 1

True

Front 2

Mendel's work on inheritance had an immediate influence on the scientific community and theories of inheritance.

Back 2

False

Front 3

Differences in plant flower color or plant height are called a variant of a trait.

Back 3

True

Front 4

A variation of a gene is called a(n) _______.

Select one:

a. species

b. morph

c. genome

d. allele

e. proteome

Back 4

Allele

Front 5

If a geneticist is studying the prevalence of a trait in a species, they are at the _________ level of study.

Select one:

a. population

b. organismal

c. cellular

d. molecular

Back 5

population

Front 6

Three populations of an organism, each with drastically different external markings, but still members of the same species, would be called _______.

Select one:

a. homologs

b. mutants

c. communities

d. alleles

e. morphs

Back 6

morphs

Front 7

Both genes and the _______ influence the traits of an organism.

Select one:

a. genome

b. environment

c. population

Back 7

environment

Front 8

The theory of pangenesis was first proposed by ________.

Select one:

a. Aristotle

b. Galen

c. Mendel

d. Hippocrates

Back 8

Hippocrates

Front 9

Mendel's work with monohybrid crosses provided proof of which of the following?

Select one:

a. Blending theory of inheritance

b. Particulate theory of inheritance

c. Chromosomal theory of inheritance

d. Pangenesis

Back 9

b. Particulate theory of inheritance

Front 10

Mendel's work with single-factor crosses resulted in the development of which of the following?

Select one:

a. Law of segregation

b. Law of independent assortment

c. Theory of natural selection

d. Law of biological evolution

Back 10

a. Law of segregation

Front 11

An individual who has two different alleles for a trait is called ____________.

Select one:

a. Haploid

b. Homozygous

c. Heterozygous

d. Isozygous

e. True-breeding

Back 11

Heterozygous

Front 12

In a dihybrid cross using Mendelian inheritance, if both parents are heterozygous for both traits, what will be the phenotypic ratio of their offspring?

Select one:

a. 3:1

b. 1:2:1

c. 1:1

d. 9:3:3:1

Back 12

d. 9:3:3:1

Front 13

In humans, patterns of inheritance are often studied using which of the following?

Select one:

a. Dihybrid testcrosses

b. Production of true-breeding lines

c. Pedigree analysis

d. Self-fertilization

Back 13

c. Pedigree analysis

Front 14

Which of the following would be used to determine the probability of three independent events in order?

Select one:

a. Sum rule

b. Product rule

c. Chi-square test

d. Binomial expansion

e. Random sampling error

Back 14

b. Product rule

Front 15

A(an) _______ is a variation of a gene.

Select one:

a. trait

b. character

c. gamete

d. allele

e. variant

Back 15

allele

Front 16

The Law of Independent Assortment states that

Select one:

a. Two different genes will randomly assort their alleles during the formation of haploid cells

b. Two different alleles will randomly assort during the formation of haploid cells

c. Two different genes will NOT randomly assort their alleles during the formation of haploid cells

d. Two different genes will randomly assort their alleles during the formation of diploid cells

Back 16

a. Two different genes will randomly assort their alleles during the formation of haploid cells

Front 17

An allele that produces an inactive enzyme would be classified as what kind of allele?

Select one:

a. Loss of function

b. Gain of function

c. Dominant

d. These do not occur and therefore there is no classification for them.

Back 17

a. Loss of function

Front 18

You are studying a diploid organism that has 14 sets of chromosomes. How many chromatids would this cell have in G2 phase?

Select one:

a. 7

b. 14

c. 28

d. 56

Back 18

56

Front 19

A karyotype is a(n) __________.

Select one:

a. organelle of eukaryotic cells.

b. stage of prophase I in meiosis.

c. division of the cytoplasmic material following mitosis.

d. organized representation of the chromosomes within a cell.

Back 19

d. organized representation of the chromosomes within a cell.

Front 20

The location of a gene on a chromosome is called its _____________.

Select one:

a. karyotype

b. allele

c. locus

d. homolog

Back 20

locus

Front 21

During this phase of the cell cycle the microtubules of the spindle fiber attach to the kinetochore:

Select one:

a. Metaphase

b. Prometaphase

c. Telophase

d. Anaphase

e. Prophase

Back 21

Prometaphase

Front 22

What represents the correct order of events during prophase I?

Select one:

a. Pachytene - diplotene - diakinesis - leptotene - zygotene

b. Leptotene - zygotene - pachytene - diplotene - diakinesis

c. Zygotene - leptotne - pachytene - diakinesis - diplotene

d. Diplotene - pachytene - leptotene - diakinesis - zygotene

Back 22

b. Leptotene - zygotene - pachytene - diplotene - diakinesis

Front 23

In a plant, which of the following is triploid (3n)?

Select one:

a. Pollen grain

b. Embryo sac

c. Seed

d. Endosperm

Back 23

d. Endosperm

Front 24

In several mammals, including some rat and shrew species, the presence of two X chromosomes means the animal will be a female, whereas having just one X chromosome dictates maleness. This type of sex determination is most similar to:

Select one:

a. other mammals.

b. insects.

c. bees.

d. birds.

Back 24

b. insects.