Final Exam Review Question Preview (ID: 56216)
Review For Final Exam Genetics.
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Which scenario breaks the law of segregation?
a) a gamete contains the father’s allele
b) the gametes produced each have 1 allele after meiosis II
c) a gamete produced has 2 of the same alleles after meiosis II
d) the gamete fertilized has the dominant trait
Some flowering plants appear to have offspring that have traits that are intermediate between those of the parents. Which type of dominance is exhibited by the offspring?
a) complete dominance
b) blended dominance
c) codominance
d) incomplete dominance
Which blood type could be given as a transfusion for patient with AB blood when the RH factor is unknown?
a) O+
b) A+
c) AB+
d) AB–
Mendel’s pea plants had either purple or white flowers. This means that the plants
a) can self-pollinate.
b) have two recessive traits.
c) have two alleles for the gene.
d) have two copies of a gene from one parent.
If Mendel had crossed a true breeding dominant plant with a true breeding recessive plant, in which of the three generations is the recessive trait visible?
a) F1 generation only
b) P generation only
c) F1 generation and F2 generation
d) P generation and F2 generation
two birds are crossed; one that is homozygous for red feathers and one that is homozygous for blue feathers. Purple offspring result due to incomplete dominance. Then, two of the purple offspring are crossed. how many of the offspring will be purple?
a) 1 in 4
b) 2 in 4
c) 3 in 4
d) 4 in 4
In roses, red flowers and long stems are dominant. A rose that is homozygous for both red flowers and long stems is crossed with one that is heterozygous for red flowers and homozygous for short stems. How many offspring will have red, long stems?
a) 25 percent
b) 50 percent
c) 75 percent
d) 100 percent
Parents with the genotypes AO and AB have a child. What are all the possible blood types of the child?
a) A, B
b) O, AB
c) A, AB, B
d) O, AB, A
A plant that has round and yellow seeds (RrYy) is crossed with a plant that has round and yellow seeds (RrYy). What is the ratio of the offspring that will have round and yellow seeds? Key: R = round r = wrinkled Y = yellow y=green
a) 1:16
b) 3:16
c) 8:16
d) 9:16
What does the notation TT mean to geneticists?
a) two dominant alleles
b) two recessive alleles
c) at least one dominant allele
d) one dominant and one recessive allelle
Factors that control traits are called
a) genes
b) purebreds
c) recessives
d) parents
Scientists call an organism that has two different alleles for a trait a
a) hybrid
b) trait
c) purebred
d) factor
What does a Punnett square show?
a) all the possible outcomes of a genetic cross
b) only the dominant alleles in a genetic cross
c) only the recessive alleles in a genetic cross
d) all of Mendel’s discoveries about genetic crosses
If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the probability that an offspring will have black fur?
a) 25 percent
b) 50 percent
c) 75 percent
d) 100 percent
An organism’s physical appearance is its
a) genotype
b) phenotype
c) codominance
d) heterozygous
What does codominance mean in genetics?
a) Both alleles are dominant.
b) Both alleles are recessive.
c) The alleles are neither dominant nor recessive.
d) Each allele is both dominant and recessive.
What happens during meiosis?
a) Each sex cell loses all of its chromosomes.
b) Chromosome pairs separate to form new sex cells.
c) Each sex cell copies itself to form four new chromosomes.
d) Chromosome pairs remain together when new sex cells are formed.
When sex cells combine to produce offspring, each sex cell will contribute
a) one fourth of the normal number of chromosomes.
b) half the normal number of chromosomes.
c) the normal number of chromosomes.
d) twice the normal number of chromosomes.
What is a mutation?
a) any change that is harmful to an organism
b) any change in a gene or chromosome
c) any change that is helpful to an organism
d) any change in the phenotype of a cell
The different forms of a gene are called
a) alleles
b) factors
c) masks
d) traits
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