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Latest ASRB ARS Genetics and Plant Breeding Exam Question (Objective Questions), MCQ in English

Subjects : Genetics & Plant Breeding

Question Bank ASRB ARS (Genetics & Plant Breeding) Preliminary Exam - English
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Genetics & Plant Breeding

Question 1Single Answer
Which of Mendel's laws states that alleles segregate randomly during gamete formation?
  1. A
    Law of Dominance
  2. B
    Law of Independent Assortment
  3. C
    Law of Segregation
  4. D
    Law of Linkage
Question 2Single Answer
A test cross involves crossing an individual with an unknown genotype with a:
  1. A
    Heterozygous individual
  2. B
    Homozygous dominant individual
  3. C
    Homozygous recessive individual
  4. D
    F1 hybrid
Question 3Single Answer
In a monohybrid cross, the phenotypic ratio in the F2 generation is typically:
  1. A
    1:1
  2. B
    3:1
  3. C
    9:3:3:1
  4. D
    1:2:1
Question 4Single Answer
Which law explains the inheritance of two or more traits simultaneously?
  1. A
    Law of Segregation
  2. B
    Law of Dominance
  3. C
    Law of Independent Assortment
  4. D
    Law of Linkage
Question 5Single Answer
What is the term for the physical expression of a gene?
  1. A
    Genotype
  2. B
    Phenotype
  3. C
    Allele
  4. D
    Locus
Question 6Single Answer
Which cell division process results in the formation of gametes?
  1. A
    Mitosis
  2. B
    Meiosis
  3. C
    Binary fission
  4. D
    Budding
Question 7Single Answer
During which phase of mitosis do sister chromatids separate?
  1. A
    Prophase
  2. B
    Metaphase
  3. C
    Anaphase
  4. D
    Telophase
Question 8Single Answer
What is the function of the spindle fibers during cell division?
  1. A
    DNA replication
  2. B
    Protein synthesis
  3. C
    Chromosome movement
  4. D
    Cell wall formation
Question 9Single Answer
Which cellular component is the site of protein synthesis?
  1. A
    Nucleus
  2. B
    Mitochondria
  3. C
    Ribosome
  4. D
    Golgi apparatus
Question 10Single Answer
What term describes genes located close together on the same chromosome?
  1. A
    Alleles
  2. B
    Linked genes
  3. C
    Homologous genes
  4. D
    Dominant genes
Question 11Single Answer
What is used to estimate the distance between linked genes?
  1. A
    Recombination frequency
  2. B
    Mutation rate
  3. C
    Gene expression level
  4. D
    Allele frequency
Question 12Single Answer
What is the maximum recombination frequency between two linked genes?
  1. A
    25%
  2. B
    50%
  3. C
    75%
  4. D
    100%
Question 13Single Answer
Which type of cross is used to detect linkage?
  1. A
    Monohybrid cross
  2. B
    Dihybrid cross
  3. C
    Test cross
  4. D
    Backcross
Question 14Single Answer
What is a map unit (centimorgan)?
  1. A
    Unit of gene expression
  2. B
    Unit of recombination frequency
  3. C
    Unit of mutation rate
  4. D
    Unit of allele frequency
Question 15Single Answer
What term describes the interaction between non-allelic genes where one gene masks the expression of another?
  1. A
    Linkage
  2. B
    Epistasis
  3. C
    Pleiotropy
  4. D
    Dominance
Question 16Single Answer
In recessive epistasis, what is the phenotypic ratio in the F2 generation?
  1. A
    9:3:3:1
  2. B
    12:3:1
  3. C
    9:7
  4. D
    15:1
Question 17Single Answer
What is the term for a gene that masks the expression of another gene?
  1. A
    Hypostatic gene
  2. B
    Epistatic gene
  3. C
    Dominant gene
  4. D
    Recessive gene
Question 18Single Answer
Which type of epistasis results in a 12:3:1 phenotypic ratio?
  1. A
    Recessive epistasis
  2. B
    Dominant epistasis
  3. C
    Duplicate recessive epistasis
  4. D
    Duplicate dominant epistasis
Question 19Single Answer
What is the term for a gene whose expression is masked by another gene?
  1. A
    Epistatic gene
  2. B
    Hypostatic gene
  3. C
    Dominant gene
  4. D
    Recessive gene
Question 20Single Answer
What is an allele?
  1. A
    A segment of DNA
  2. B
    An alternative form of a gene
  3. C
    A protein
  4. D
    A chromosome
Question 21Single Answer
What term describes the complete set of genetic material in an organism?
  1. A
    Phenotype
  2. B
    Genotype
  3. C
    Genome
  4. D
    Allele
Question 22Single Answer
What is the term for the location of a gene on a chromosome?
  1. A
    Allele
  2. B
    Locus
  3. C
    Genotype
  4. D
    Phenotype
Question 23Single Answer
What is the term for having two identical alleles for a gene?
  1. A
    Heterozygous
  2. B
    Homozygous
  3. C
    Hemizygous
  4. D
    Diploid
Question 24Single Answer
What is the term for having two different alleles for a gene?
  1. A
    Homozygous
  2. B
    Heterozygous
  3. C
    Hemizygous
  4. D
    Diploid
Question 25Single Answer
What is the term for inheritance patterns that do not follow Mendelian laws?
  1. A
    Nuclear inheritance
  2. B
    Extra chromosomal inheritance
  3. C
    Linkage
  4. D
    Epistasis
Question 26Single Answer
Which organelle is primarily associated with extra chromosomal inheritance in plants?
  1. A
    Nucleus
  2. B
    Mitochondria and chloroplasts
  3. C
    Golgi apparatus
  4. D
    Endoplasmic reticulum
Question 27Single Answer
What is maternal inheritance?
  1. A
    Inheritance of genes from both parents
  2. B
    Inheritance of genes only from the mother
  3. C
    Inheritance of genes only from the father
  4. D
    Inheritance of genes from the environment
Question 28Single Answer
What is the term for cytoplasmic genes in chloroplasts?
  1. A
    Nuclear DNA
  2. B
    Plastid DNA (ptDNA)
  3. C
    Mitochondrial DNA
  4. D
    Genomic DNA
Question 29Single Answer
What is the term for cytoplasmic genes in mitochondria?
  1. A
    Nuclear DNA
  2. B
    Plastid DNA
  3. C
    Mitochondrial DNA (mtDNA)
  4. D
    Genomic DNA
Question 30Single Answer
In a dihybrid cross involving two heterozygous individuals (AaBb x AaBb), what is the expected phenotypic ratio in the F2 generation?
  1. A
    3:1
  2. B
    1:2:1
  3. C
    9:3:3:1
  4. D
    1:1:1:1
Question 31Single Answer
What type of dominance is observed when the heterozygous phenotype is an intermediate between the two homozygous phenotypes?
  1. A
    Complete dominance
  2. B
    Incomplete dominance
  3. C
    Codominance
  4. D
    Epistasis
Question 32Single Answer
In codominance, what happens to the heterozygous phenotype?
  1. A
    It expresses only the dominant allele.
  2. B
    It expresses only the recessive allele.
  3. C
    It expresses both alleles simultaneously.
  4. D
    It expresses an intermediate phenotype.
Question 33Single Answer
What is the term for a trait controlled by multiple genes?
  1. A
    Monogenic trait
  2. B
    Polygenic trait
  3. C
    Pleiotropic trait
  4. D
    Epistatic trait
Question 34Single Answer
What is the probability of getting a homozygous recessive offspring from a cross between two heterozygous parents?
  1. A
    25%
  2. B
    50%
  3. C
    75%
  4. D
    100%
Question 35Single Answer
What is the function of the centromere?
  1. A
    DNA replication
  2. B
    Protein synthesis
  3. C
    Joining sister chromatids
  4. D
    Cell wall formation
Question 36Single Answer
What is the end product of meiosis?
  1. A
    Two diploid cells
  2. B
    Four haploid cells
  3. C
    Two haploid cells
  4. D
    Four diploid cells
Question 37Single Answer
What is the role of the Golgi apparatus in a cell?
  1. A
    Protein synthesis
  2. B
    Packaging and modifying proteins
  3. C
    Energy production
  4. D
    DNA replication
Question 38Single Answer
What is the function of mitochondria?
  1. A
    Protein synthesis
  2. B
    Energy production
  3. C
    DNA replication
  4. D
    Cell wall formation
Question 39Single Answer
During which phase of meiosis do homologous chromosomes separate?
  1. A
    Prophase II
  2. B
    Metaphase II
  3. C
    Anaphase I
  4. D
    Anaphase II
Question 40Single Answer
What is the term for the arrangement of genes on a chromosome?
  1. A
    Allele frequency
  2. B
    Gene mapping
  3. C
    Mutation rate
  4. D
    Gene expression
Question 41Single Answer
What is the result of crossing over between linked genes?
  1. A
    Increased homozygosity
  2. B
    Recombinant genotypes
  3. C
    Decreased heterozygosity
  4. D
    Gene duplication
Question 42Single Answer
If two genes are tightly linked, what is the expected recombination frequency?
  1. A
    High
  2. B
    Low
  3. C
    50%
  4. D
    100%
Question 43Single Answer
What is the purpose of a three-point test cross?
  1. A
    To determine dominance
  2. B
    To map the order and distances between three linked genes
  3. C
    To study epistasis
  4. D
    To study codominance
Question 44Single Answer
What is a double crossover?
  1. A
    A single recombination event
  2. B
    Two recombination events between the same two genes
  3. C
    Two recombination events in different regions of the same chromosome
  4. D
    A mutation event
Question 45Single Answer
In duplicate recessive epistasis, what is the phenotypic ratio in the F2 generation?
  1. A
    9:3:3:1
  2. B
    12:3:1
  3. C
    9:7
  4. D
    15:1
Question 46Single Answer
In duplicate dominant epistasis, what is the phenotypic ratio in the F2 generation?
  1. A
    9:3:3:1
  2. B
    12:3:1
  3. C
    9:7
  4. D
    15:1
Question 47Single Answer
What is the term for a gene that has multiple phenotypic effects?
  1. A
    Epistatic gene
  2. B
    Hypostatic gene
  3. C
    Pleiotropic gene
  4. D
    Linked gene
Question 48Single Answer
What is the effect of epistasis on the expected Mendelian ratios?
  1. A
    It maintains the expected ratios.
  2. B
    It modifies the expected ratios.
  3. C
    It eliminates the expected ratios.
  4. D
    It has no effect on the expected ratios.
Question 49Single Answer
What is the term for the interaction between alleles of the same gene?
  1. A
    Epistasis
  2. B
    Dominance
  3. C
    Linkage
  4. D
    Pleiotropy
Question 50Single Answer
What is the term for a gene that is present in only one copy in a diploid organism?
  1. A
    Homozygous
  2. B
    Heterozygous
  3. C
    Hemizygous
  4. D
    Polyploid
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