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 other

B. Transfer the ovule from one plant to the other

C. Transfer pollen from one plant to the other

D. Transfer a pea from one plant to the other

E. Transfer the stigma from one plant to the other

C. Transfer pollen from one plant to the other

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

A. F1

B. F2

C. F3
D. P

E. P2

A. F1

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

A. Test cross

B. Dihybrid cross

C. Monohybrid cross

D. Phenotypic cross

E. Genotypic cross

C. Monohybrid cross

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

A. are distributed to separate gametes

What are alleles?

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

B. the locations of genes on chromosomes

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

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

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

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

A. phenotype

Assume in humans that eye color is a single allele trait, with brown eyes (B) being dominant over blue eyes (b). A brown-eyed woman who has a blue-eyed child would have the genotype:

A. bb

B. Bb

C. BB

D. BbBb

B. Bb

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

C. homozygous

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

A. phenotype

B. genotype

C. homozygous

D. gene locus

E. heterozygous

E. heterozygous

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

A. Dominant

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%

E. 0%

A woman who can roll her tounge (presumably dominant) is married to a man who cannot.  Two of their four children can roll their tounges, 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

D. Woman Aa, man aa

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

C. Only tt

If a genotype of an organism is YySsTt, then yST would represent which of the following?

A. the genotype of the offspring

B. a possible phenotype of the offspring

C. a possible gamete of the parent

D. a possible zygote

E. the P-generation

C. a possible gamete of the parent

Two individuals with window's peak and short fingers have a child with a continuous hairline and long fingers.  What are the genotypes of the parents (W = window's peak; S = short finger)

A. WWSS x wwss

B. WsWs x WsWs

C. WwSs x WwSs

D. Wwss x wwss

C. WwSs x WwSs

E. 6 black hair, 6 black long hair, 2 brown short hair, 2 brown long hair

A. Recessive

D. They are cousins

Both parents are heterozygous for Tay-Sachs disease which is recessive.  If three children in a row were born with Tay-Sachs disease, what are the chances that the fourth child will have Tay-Sachs disease?

A. 0%

B. 25%

C. 50%

D. 75%

B. 25%

Which of the following disorders is characterized by thick, viscous mucus production in the lungs and digestive tract?

A. Sickle-cell disease

B. Huntington disease

C. Tay-Sachs disease

D. PKU

E. Cystic fibrosis

E. Cystic fibrosis

If your mother is homozygous recessive and your father is heterozygous for Huntington disease which is dominant, what are your chances of escaping the disease?

A. 100%

B. 75%

C. 50%

D. 25%

E. 0%

C. 50%

The four o'clock flower is an example of incomplete dominance. R = red, r = white, and Rr = pink.  If two hybrids are crossed,, what are the chances that an offspring will have pink flowers?

A. 0%

B. 25%

C. 50%

D. 75%

C. 50%

When dominant alleles are both fully expressed in the phenotype, it is referred to as:

A. Simple dominance

B. Incomplete dominance

C. Polygenic dominance

D. Codominance

D. Codominance

A person with Marfan syndrome could have all the following symptoms except:

A. disproportionately long arms and legs

B. disproportionately long hands and feet

C. an inability to clot blood

D. a weakened aorta

E. poor eyesight

C. an inability to clot blood

If a woman is a carrier for colorblindness and her husband is normal, what are their chances that a son will be colorblind?

A. none since the father is normal

B. 50% since the mother is a carrier

C. 100% since the mother has the gene

D. 25% since the mother is a carrier

E. none since he will also be just a carrier

B. 50% since the mother is a carrier

A female guinea pig homozygous dominant for black fur color is mated with a male homozygous for white fur color.  In a litter of eight offspring there would probably be _________.

A. 8 black guinea pigs

B. 4 black and 4 white guinea pigs

C. 2 black, 4 gray, and 2 white guinea pigs

D. 8 white guinea pigs

A. 8 black guinea pigs

Mendel's law of segregation states that during meiosis, the factors that control each trait seperate, and only ______ from each pair is/are passed to the offspring.

A. one factor (or allele)

B. two factors (or alleles)

C. the dominant trait

D. the recessive trait

A. one factor (or allele)

A child is diagnosed with a rare genetic disease.  Neither parent has the disease.  How might the child have inherited the disorder?

A. the disorder is dominant and was carried by a parent

B. the disorder is recessive and carried by both parents

C. the disorder is sexlinked and inherited from the father

D. the disorder could only occur as a mutation in the child because neither parent had the disease.

B. the disorder is recessive and carried by both parents

If the probability of event A is 3/4 and the probability of event B is 1/4, then the probability of both A and B occuring at the same time is

A. 3/4

B. 1/4

C. 1 or absolutely certain

D. 1/2

E. 3/16

E. 3/16

B. sex linkage

C. 2

Humans have 22 pairs of ______________ type chromosomes and 1 pair of __________ type chromosomes.

(fill in the blank)

Humans have 22 pairs of autosome type chromosomes and 1 pair of sex type chromosomes.

A graphic representation of an individual's family tree is a _______________.

A graphic representation of an individual's family tree is a pedigree.

The type of inheritance which results in an in-between color or trait when heterozygous is __________.

The type of inheritance which results in an in-between color or trait when heterozygous is incomplete dominance.

The type of inheritance when both alleles are expressed when heterozygous is _________.

The type of inheritance when both alleles are expressed when heterozygous is codominant.

Female sex chromosomes include only ____ while male sex chromosomes include both ___ and ___.

Female sex chromosomes include only X while male sex chromosomes include both X and Y.