Welcome to the Inheritance Of Single Trait MDCAT MCQs with Answers. In this post, we have shared Inheritance Of Single Trait Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Biology offers a chance to enhance your knowledge regarding Inheritance Of Single Trait MCQs in this MDCAT Online Test.
In a monohybrid cross, the phenotypic ratio of the F2 generation is:
a) 1:1
b) 3:1
c) 9:3:3:1
d) 1:2:1
In a monohybrid cross, what is the genotypic ratio of the F2 generation?
a) 1:2:1
b) 3:1
c) 9:3:3:1
d) 1:1
If a homozygous dominant plant (AA) is crossed with a homozygous recessive plant (aa), what will be the genotype of the F1 generation?
a) AA
b) aa
c) Aa
d) Aaaa
In a monohybrid cross, the recessive phenotype appears in which generation?
a) P generation
b) F1 generation
c) F2 generation
d) F3 generation
Which law explains the segregation of alleles during gamete formation?
a) Law of Independent Assortment
b) Law of Segregation
c) Law of Uniformity
d) Law of Dominance
What is the phenotype of the F1 generation when crossing two pure-breeding plants with contrasting traits?
a) Dominant
b) Recessive
c) Blended
d) Intermediate
In Mendel’s monohybrid cross, what is the phenotypic ratio of the F2 generation?
a) 1:2
b) 3:1
c) 1:1
d) 9:3:3:1
The principle that states that alleles for different traits are inherited independently of each other applies to:
a) Monohybrid crosses
b) Dihybrid crosses
c) Test crosses
d) Back crosses
Which of the following genotypes represents a homozygous recessive individual?
a) AA
b) Aa
c) aa
d) Aaaa
The ratio of heterozygous to homozygous individuals in the F2 generation of a monohybrid cross is:
a) 1:2
b) 2:1
c) 3:1
d) 1:1
In a monohybrid cross, the F1 generation is:
a) Genotypically diverse
b) Phenotypically diverse
c) Genotypically uniform
d) Phenotypically mixed
If two heterozygous plants (Aa x Aa) are crossed, what is the expected genotypic ratio in the F2 generation?
a) 1:2:1
b) 3:1
c) 9:3:3:1
d) 1:1
In a monohybrid cross, if the F1 generation plants are self-pollinated, what ratio of dominant to recessive phenotypes is expected in the F2 generation?
a) 1:1
b) 2:1
c) 3:1
d) 1:2
The genotype of an organism that exhibits a recessive phenotype is always:
a) Homozygous dominant
b) Heterozygous
c) Homozygous recessive
d) Mixed
In Mendel’s pea plant experiments, a plant with a recessive phenotype must have a genotype that is:
a) Homozygous dominant
b) Homozygous recessive
c) Heterozygous
d) Blended
In a monohybrid cross, the F2 generation’s phenotypic ratio is the result of:
a) Independent assortment of genes
b) Segregation of alleles
c) Blending inheritance
d) Environmental effects
In a monohybrid cross, the genotypic ratio of the F2 generation is:
a) 1:1
b) 3:1
c) 1:2:1
d) 9:3:3:1
If a plant with a dominant phenotype is crossed with a homozygous recessive plant, the phenotypic ratio of the offspring will be:
a) 1:1
b) 3:1
c) 9:3:3:1
d) 1:2:1
The principle of dominance explains why:
a) Recessive traits are not expressed in the F1 generation
b) Dominant traits are always expressed
c) Traits blend in the F2 generation
d) Genes are inherited independently
In a monohybrid cross, the phenotype ratio in the F1 generation is:
a) 1:1
b) 3:1
c) 9:3:3:1
d) All dominant
Mendel’s observation of dominant and recessive traits was based on:
a) The F1 generation
b) The P generation
c) The F2 generation
d) Natural variations
When a dominant phenotype individual is crossed with a homozygous recessive individual, the offspring will be:
a) All recessive
b) All dominant
c) A mix of dominant and recessive
d) Mixed with some homozygous recessive
If two heterozygous individuals (Aa x Aa) are crossed, the expected phenotypic ratio in the F2 generation is:
a) 1:2:1
b) 3:1
c) 9:3:3:1
d) 1:1
Which of the following represents a heterozygous genotype?
a) AA
b) aa
c) Aa
d) AAA
A plant with the genotype AaBb is crossed with another AaBb plant. The expected phenotypic ratio for a single trait in the F2 generation is:
a) 3:1
b) 1:1
c) 1:2:1
d) 9:3:3:1
The phenotypic ratio of 3:1 in the F2 generation of a monohybrid cross is due to:
a) Segregation of alleles
b) Independent assortment of genes
c) Blending inheritance
d) Environmental influence
The principle that two alleles for a trait segregate during gamete formation is known as:
a) Law of Independent Assortment
b) Law of Segregation
c) Law of Uniformity
d) Law of Dominance
If a dominant phenotype individual’s genotype is unknown, what type of cross can determine its genotype?
a) Test cross
b) Dihybrid cross
c) Back cross
d) Self cross
Which of the following is a true-breeding genotype?
a) Aa
b) AA
c) AaBb
d) aa
In Mendel’s experiments, the plants of the F2 generation that showed a dominant phenotype could be:
a) Homozygous dominant or heterozygous
b) Homozygous recessive
c) Always homozygous dominant
d) Always heterozygous
The cross between two heterozygous individuals for a single trait produces a phenotypic ratio in the F2 generation of:
a) 1:2:1
b) 3:1
c) 1:1
d) 9:3:3:1
The expected genotypic ratio for a monohybrid cross in the F2 generation is:
a) 1:2:1
b) 3:1
c) 9:3:3:1
d) 1:1
When crossing two homozygous plants, the F1 generation will be:
a) Heterozygous for the trait
b) Homozygous for the trait
c) A mix of dominant and recessive phenotypes
d) All recessive
If a plant with a dominant phenotype is crossed with a plant of unknown genotype, what type of cross should be performed to determine the genotype?
a) Test cross
b) Dihybrid cross
c) Monohybrid cross
d) Self cross
The genotype of an organism showing a dominant phenotype could be:
a) AA or Aa
b) aa
c) aa or Aa
d) AA only
The phenotypic ratio of 3:1 in the F2 generation of a monohybrid cross is due to:
a) Segregation of alleles
b) Independent assortment of genes
c) Blending inheritance
d) Environmental influence
Which of the following is true about recessive traits in a monohybrid cross?
a) They are expressed in the F1 generation
b) They are expressed only when two recessive alleles are present
c) They are never expressed
d) They blend with dominant traits
In a cross between two heterozygous individuals (Aa x Aa), the probability of obtaining an offspring with a recessive phenotype is:
a) 1/4
b) 1/2
c) 3/4
d) 1/8
A plant with the genotype AaBb x AaBb is a cross of:
a) Two homozygous plants
b) Two heterozygous plants
c) A homozygous dominant and a homozygous recessive plant
d) A homozygous recessive and a heterozygous plant
In a monohybrid cross, the expected phenotypic ratio of the F2 generation is:
a) 1:2:1
b) 3:1
c) 9:3:3:1
d) 1:1
If a pea plant with genotype Aa is crossed with another Aa plant, the probability of obtaining an AA genotype in the offspring is:
a) 1/4
b) 1/2
c) 3/4
d) 1/8
The principle of dominance explains why:
a) Recessive traits are always masked by dominant traits
b) Dominant traits are always blended in the F1 generation
c) Recessive traits are never observed
d) Traits are inherited independently
In a cross between two heterozygous individuals (Aa x Aa), the expected genotypic ratio is:
a) 1:1
b) 3:1
c) 1:2:1
d) 9:3:3:1
When crossing two homozygous plants, the offspring will be:
a) Homozygous dominant or homozygous recessive
b) Heterozygous
c) A mix of dominant and recessive phenotypes
d) All recessive
If a plant with genotype AaBb is crossed with a homozygous recessive plant (aabb), what will be the phenotypic ratio for each trait?
a) 1:1:1:1
b) 9:3:3:1
c) 3:1
d) 1:2:1
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