Chapter 9: Principles Of Genetics Review / Study Guide

Front 1

The "Father" of genetics was...

Back 1

C. Gregor Mendel

Front 2

What is the probability that the offspring of a homozygous dominant individual and a homozygous recessive individual will exhibit the dominant phenotype?

Back 2

D. 1.0

Front 3

The first filial (F1) generation is the result of a cross between________ generations with opposing traits.

Back 3

B. P and P

Front 4

Which of the following is the designation for Mendel's original "True-Breeding" strains of plants?

Back 4

A. P

Front 5

The passing of traits from parents to offspring is called______________.

Back 5

D. Heredity

Front 6

A genetic trait that is always expressed in the offspring is called a_________ trait.

Back 6

A. Dominant

Front 7

If one parent is recessive and the other is heterozygous, the probability of recessive offspring is______.

Back 7

B. .5

Front 8

To explain distribution of multiple traits during gamete formation, Mendel proposed the law of_____________________________.

Back 8

A. Independent Assortment

Front 9

The phenotype of an organism__________________________________________________________________.

Back 9

B. reflects traits that are actually expressed.

Front 10

If an individual has two recessive alleles for the same trait, the individual is said to be________________.

Back 10

A. Homozygous.

Front 11

Tallness, (T) is dominant over shortness (t) in pea plants. Which of the following represents the genotype of a pea plant that is homozygous for shortness?

Back 11

D. tt

Front 12

How many different phenotypes can be produced by crossing heterozygous parents with codominant alleles?

Back 12

C. 3 = Black, white, B&W

Front 13

A red flower is crossed with a yellow flower resulting in all orange flowers. This condition is called________________________________.

Back 13

B. Incomplete Dominance

Front 14

The expected genotype ratio resulting from a homozygous recessive x heterozygous monohybrid cross is_______.

Back 14

B. 1:1

Front 15

In a dihybrid cross, what fraction of the offspring would we expect to be homozygous recessive for both traits when both parents are heterozygous for both traits?

Back 15

D. 1/16

Front 16

What is the expected genotype ratio resulting from a heterozygous x heterozygous monohybrid cross?

Back 16

A. 1:2:1

Front 17

What is the expected phenotype ratio resulting from a homozygous dominant x heterozygous monohybrid cross is?

Back 17

D. 1.0

Front 18

An organism that has inherited two of the same alleles of a gene from its parents is called_________________.

Back 18

C. Homozygous

Front 19

In pea plants, yellow seeds are dominant over green seeds. What would be the expected genotype ratio in a cross between a plant with green seeds and a plan that is heterozygous for seed color?

Back 19

D. 1:1

Front 20

What fraction of the offspring resulting from a heterozygous x heterozygous dihybrid cross would we expect to express both dominant traits?

Back 20

A. 9/16

Front 21

A cross of two individuals for a single contrasting trait is called______________________ cross.

Back 21

A. Monohybrid

Front 22

Blood type is inherited as a combination of two alleles from three possible, to form how many genotypes?

Back 22

D. 6

Front 23

If one parent is heterozygous for type A blood and the other is heterozygous for type B blood, then their children could have what blood type?

Back 23

E. A, B, AB, or O

Front 24

When two orange snapdragons flowers are crossed, we would expect the resulting phenotypes to be___________________________.

Back 24

B. One red, two orange, and one yellow

Front 25

Human blood type alleles (A, B, O) can combine to form how many phenotypes?

Back 25

C. 4

Front 26

Crossing a two pink snapdragon flowers will likely result in ______ red snapdragons.

Back 26

C. 25%

Front 27

Since eyes color traits are carried on the X chromosome in fruit flies, crossing a heterozygous red eyed female with a red eyed male will result in_________ of the males having white eyes.

Back 27

C. 50%

Front 28

Given the facts from #32, the genotype of a white eyed female fruit fly would be__________.

Back 28

B. XrXr