In the monohybrid crosses, Mendel deduced that one trait was recessive because:
A. That trait was not present in the F1 and did not reappear in the F2.
B. That trait was present in the F1 and in the F2.
C. That trait was not present in the F1 and reappear
C. That trait was not present in the F1 and reappeared in the F2.
Organisms with similar phenotypes:
A. must have similar genotypes
B. are derived from the same parents
C. always carry recessive traits
D. may have different genotypes
E. can only occur in the F1 generation
D. may have different genotypes
In a monohybrid cross with complete dominance, the F2 offspring should contain:
A. two different phenotypes and two different genotypes
B. two different phenotypes and three different genotypes
C. three different phenotypes and two different genotypes
D.
B. two different phenotypes and three different genotypes
Alternate forms of a gene are best described as:
A. homologues
B. loci
C. alleles
D. homozygous
E. heterozygous
C. alleles
Independent assortment means that:
A. Monohybrid crosses will show segregation and independent assortment.
B. The segregation of one gene pair depends on the segregation of another gene pair.
C. The gametes produced must be heterozygous in all cases.
D. T
D. The segregation of one gene pair occurs as if no other gene pair was present.
In a cross between a true-breeding plant bearing smooth, yellow seeds and a true-breeding plant with
wrinkled, green seeds, the offspring were all smooth and yellow. What is the genotype of the F1 plants?
A. SSYY
B. ssyy
C. SsYy
D. ssYY
E. SSyy
C. SsYy
In the above cross, what are the genotypes of the gametes that the F1 can form?
A. SY, Sy, Sy, sy
B. SY, Sy, sY, sy
C. SY, Sy, sy, sy
D. sY, sY, sy, sy
E. sY, Sy, Sy, sy
B. SY, Sy, sY, sy
In the F2 of the cross above, what proportion of the plants will have the genotype SsYy?
A. 1/16
B. 2/16
C. 3/16
D. 4/16
E. 9/16
D. 4/16
In a cross involving incomplete dominance:
A. The dominant phenotype is expressed in the F1.
B. The recessive phenotype is expressed in the F1.
C. Mendelian inheritance does not apply.
D. The phenotypic ratio and genotypic ratio in the F2 are identical.
E
D. The phenotypic ratio and genotypic ratio in the F2 are identical.
The phenotype is:
A. controlled by the genotype
B. the expression of a trait in an organism
C. the result of inheritance from both parents
D. never homozygous
E. all of these
B. the expression of a trait in an organism
In a situation with codominant inheritance:
A. There is no recessive phenotype.
B. Each allele is fully and completely expressed.
C. The principles of Mendelian inheritance are intact.
D. Independent assortment can predict the genotypes and phenotypes of
E. All of these are true.
Which one of the following statements about the chromosome theory of inheritance is FALSE?
A. Genes and chromosomes occur in pairs; one member of each pair is maternally derived, and the other is paternally derived.
B. The arrangement of chromosomes at me
B. The arrangement of chromosomes at metaphase of meiosis depends on the arrangement of all other chromosome pairs.
A locus is best defined as:
A. an allele of a gene
B. the chromosome location of the centromere
C. the chromosomal location of a gene
D. a mutation of a gene to an alternate state
E. the site of crossing over
C. the chromosomal location of a gene
Pedigrees:
A. provide information on the patterns of inheritance of a trait
B. can identify those at risk for a disease
C. can identify those at risk for transmitting a disease
D. can be used to deduce the genotypes of parents
E. all of these
E. all of these
In the ABO multiple allele system, there are the following combinations of genotypes and phenotypes:
A. 4 genotypes, 4 phenotypes
B. 4 genotypes, 6 phenotypes
C. 6 genotypes, 6 phenotypes
D. 6 genotypes, 4 phenotypes
E. 3 genotypes, 4 phenotypes
D. 6 genotypes, 4 phenotypes
A pea plant with yellow peas is crossed with a pea plant that has green peas. The offspring include
both yellow-pea and green-pea plants. The original plant with yellow peas must, therefore, have what
genotype?
A. YY
B. Yy
C. yy
D. It cannot be determined
B. Yy
Mendel chose to work with pea plants for what good reason(s)?
A. Many varieties were available from seed dealers.
B. They grow and flower relatively quickly.
C. They can self-fertilize or be artificially fertilized by hand.
D. They can be grown in the gro
E. All of these.
A chi square test is done to determine:
A. whether an organism with a dominant phenotype is homozygous or heterozygous
B. whether an allele exhibits complete or incomplete dominance
C. what the predicted outcome of a dihybrid cross will be
D. how closely
D. how closely actual results of a cross match the expected results
In a pedigree, a person whose symbol is filled in and who is associated with the roman numeral II:
A. is affected by the trait and in the second generation
B. is not affected by the trait and in the second generation
C. is affected by the trait and is the
A. is affected by the trait and in the second generation
The Bombay gene affects expression of the ABO blood type. What would be the blood type of a
person with the genotype hhIAIB?
A. Type A
B. Type B
C. Type AB
D. Type O
E. It is not possible to determine without additional information.
D. Type O
The dominant alleles of genes always
A. are more common than recessive alleles
B. are better for the fitness of the organism than recessive alleles
C. produce bolder, more noticeable phenotypes than recessive alleles
D. are expressed in heterozygotes
E. a
D. are expressed in heterozygotes
Mendel used the principle called "Ockham's Razor" to conclude that
A. individuals have only two copies of each gene
B. some alleles are dominant, some recessive
C. genes segregate during gamete formation
D. different genes segregate independently
E. none
A. individuals have only two copies of each gene