Genetics

Question 1

What is the probability that the offspring of a homozygous dominant individual and a homozygous recessive individual will exhibit the dominant phenotype?
A. 100%
B. 50%.
C. 25%.
D. 75%.

Answer 1

A; 100%.

Question 2

How many different phenotypes can be produced by a pair of codominant alleles?
A. 4
B. 3
C. 1
D. 2

Answer 2

B; 3.

Question 3

If a characteristic is sex-linked, it:
A. occurs only in females.
B. Is always fatal.
C. Occurs most commonly in males.
D. Can never occur in females.

Answer 3

C; Occurs most commonly in males.

Question 4

Since the allele for colorblindness is located on the X chromosome, colorblindness:
A. cannot be inherited.
B. Is sex-linked.
C. Occurs only in adults.
D. None of the above

Answer 4

B; Is sex-linked.

Question 5

The passing of traits from one generation to another is called:
A. Maturation.
B. Heredity
C. Development.
D. Genetics

Answer 5

B; Heredity

Question 6

A diagram in which several generations of a family and the occurrence of certain genetic characteristics are shown is called a:
A. Pedigree
B. Monohybrid Cross.
C. Family Karyotype.
D. Punnett Square.

Answer 6

A; Pedigree

Question 7

Which of the following describes hemophilia?
A. Multiple-allele trait.
b. Codominant trait.
C. Dominant trait.
D. Sex-linked trait.

Answer 7

D; Sex-linked trait.

Question 8

The phenotype of an organism:
A. Occurs only in dominant pure organisms.
B. Cannot be seen.
C. Is the physical appearance of a trait.
D. Represents its genetic composition.

Answer 8

C; Is the physical appearance of a trait.

Question 9

An individual heterozygous for a trait and an individual homozygous recessive for a trait are crosses and produce many offspring that are:
A. All three different phenotypes.
B. All the same phenotype.
C. All the same genotype.
D. Of two different phenotypes.

Answer 9

D; Of two different phenotypes.

Question 10

If a couple had 2 children and all were boys, what is the probability that if they have another child, it will be a girl?
A. 2/3
B. 1/2
C. 1/3
D. 1/4

Answer 10

B; 1/2

Question 11

Tallness (T) is dominant to shortness (t) in pea plants. Which of the following represents a genotype of a pea plant that is heterozygous for tallness?
A. Tt.
B. T
C. tt
D. TT

Answer 11

A; Tt.

Question 12

If an individual possesses two recessive alleles for the same trait, the individual is said to be:
A. Homozygous for the trait.
B. Mutated.
C. Haploid for the trait.
D. Heterozygous for the trait.

Answer 12

A; Homozygous for the trait.

Question 13

F2: F1 ::
A. P:F1
B. F1:F2
C. F1:P
D. Dominant trait:Recessive trait

Answer 13

C; F1:P.

Question 13

The father of genetics was
A. Hans Krebs.
B. A. Knight
C. Gregor Mendel
D. George Washington

Answer 13

C; Gregor Mendel

Question 14

The scientific study of heredity is called:
A. pollination
B. Crossing-over
C. Meiosis
D. Genetics

Answer 14

D; Genetics

Question 15

A situation in which two dominant alleles are expressed at the same time is called ___

Answer 15

Co-dominance.

Question 16

What are the possible genotypes for Type A blood?

Answer 16

AO, AA

Question 17

What are the possible genotypes for Type B blood?

Answer 17

BO, BB

Question 18

What are the possible genotypes for Type AB blood?

Answer 18

AB.

Question 19

What are the possible genotypes for Type O blood?

Answer 19

OO.

Question 20

What blood type can A+ recieve from?

Answer 20

A-, A+, O-, O+

Question 21

What blood type can B- recieve from?

Answer 21

B-, O-

Question 22

What blood type can O- recieve from?

Answer 22

O-

Question 23

Who is the universal donor?

Answer 23

Type O-

Question 24

Who is the universal recipient?

Answer 24

Type AB+

Question 25

What blood type can O+ recieve from?

Answer 25

O-, O+

Question 26

What blood type can AB- recieve from?

Answer 26

A-, B-, O-, AB-

Question 27

What blood type can AB+ recieve from?

Answer 27

Every.

Question 28

What are the types of gametes that could be produced by a Yy plant?

Answer 28

Y or y.

Question 29

T or F: In heterozygous individuals, only the recessive allele is expressed.

Answer 29

F.

Question 30

T or F: Individuals must exhibit a trait in order for it to appear in their offspring.

Answer 30

F.

Question 31

T or F: In co-dominance, two dominant alleles are expressed at the same time.

Answer 31

T

Question 32

T or F: A dominant allele masks the effect of the recessive allele.

Answer 32

T.

Question 33

T or F: Heterozygous individuals have two of the same alleles for a particular gene.

Answer 33

F.

Question 34

T or F: All genes only have two alleles

Answer 34

F.

Question 35

The likelihood that a specific event will occur is called __.

Answer 35

Probability.

Question 36

A trait controlled by three or more alleles is said to have ___.

Answer 36

Multiple alleles.

Question 37

Different forms of a particular gene are called ___.

Answer 37

Alleles.

Question 38

Hybrid means the same as ___.

Answer 38

Heterozygous.