How many times does DNA replication occur during meiosis?
A. Not at all
B. Four times
C. Twice
D. Three times
E. Once
Select an answer
p.2
Explanation
DNA replication occurs only once during meiosis, before the two successive nuclear divisions take place, which is essential for producing haploid cells.
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p.2
Process of Meiosis
How many times does DNA replication occur during meiosis?
E
p.2
Importance of Haploid Gametes
What type of cells are produced at the end of meiosis?
D
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Importance of Haploid Gametes
What happens during fertilization in relation to gametes?
C
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Process of Meiosis
What is the role of interphase in meiosis?
C
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2
Process of Meiosis
What is the main outcome of meiosis?
E
p.3
Process of Meiosis
What type of cells are produced by meiosis?
C
p.3
Process of Meiosis
How many chromosomes are present in the daughter cells after meiosis if the parent cell has four chromosomes?
B
p.3
Genetic Recombination and Crossing Over
What is the significance of homologous chromosomes in meiosis?
B
p.3
Process of Meiosis
What is the first stage of meiosis called?
D
p.4
Independent Segregation of Chromosomes
What is the main feature of meiosis that contributes to genetic variation in gametes?
D
p.4
Independent Segregation of Chromosomes
How many different combinations of chromosomes can be produced from 3 homologous pairs during meiosis?
D
p.4
Independent Segregation of Chromosomes
What does the formula 2ⁿ represent in the context of meiosis?
E
p.4
Independent Segregation of Chromosomes
What occurs during the first meiotic division regarding homologous chromosomes?
E
p.4
Independent Segregation of Chromosomes
What is the significance of independent segregation in meiosis?
C
p.5
Genetic Recombination and Crossing Over
During which phase of meiosis does crossing over occur?
D
p.5
Genetic Recombination and Crossing Over
What is the structure formed by homologous chromosomes during crossing over?
B
p.5
Genetic Recombination and Crossing Over
What is the result of crossing over in terms of genetic material?
E
p.5
Genetic Recombination and Crossing Over
How does the frequency of cross-over gametes compare to parental gametes?
E
p.5
Genetic Recombination and Crossing Over
What is the overall process of exchanging genetic material during meiosis called?
C
p.6
Genotype and Phenotype Definitions
What does the term 'genotype' refer to in genetics?
A
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Genotype and Phenotype Definitions
What is a dominant allele?
A
p.6
Genotype and Phenotype Definitions
What does 'homozygous' mean in genetics?
B
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Codominance and Multiple Allelism
What is codominance in genetics?
E
p.6
Sex-Linked Genes
What is a sex-linked gene?
A
p.7
Genotype and Phenotype Definitions
What is the genetic composition of an organism called?
D
p.7
Genotype and Phenotype Definitions
What is a change in the genetic composition called?
A
p.7
Genotype and Phenotype Definitions
What is the appearance of a characteristic called?
D
p.7
Genotype and Phenotype Definitions
What are the different forms of a gene called?
C
p.7
Genotype and Phenotype Definitions
What is an allele that is not apparent in the phenotype when paired with a dominant allele called?
C
p.7
Genotype and Phenotype Definitions
What are two alleles that contribute equally to a characteristic called?
D
p.8
Monohybrid Inheritance
What does monohybrid inheritance refer to?
B
p.8
Monohybrid Inheritance
In Mendel's experiment, what was the phenotype ratio of tall to dwarf plants in the F₂ generation?
C
p.8
Monohybrid Inheritance
What is the genotype of a dwarf pea plant according to Mendel's findings?
A
p.8
Monohybrid Inheritance
What does the 'T' allele represent in Mendel's study?
E
p.8
Monohybrid Inheritance
What were the genotypes of the F₁ generation plants in Mendel's experiment?
A
p.9
Codominance and Multiple Allelism
What is codominance in genetics?
C
p.9
Codominance and Multiple Allelism
What is the genotype of a red flower in snapdragons?
A
p.9
Codominance and Multiple Allelism
What is the F₁ phenotype ratio when crossing two pink snapdragon flowers?
B
p.9
Codominance and Multiple Allelism
What are the possible genotypes from a cross between two pink snapdragons?
A
p.9
Codominance and Multiple Allelism
What phenotype results from the genotype CᴿCᵂ in snapdragons?
E
p.10
Multiple Allelism
What is multiple allelism?
E
p.10
Multiple Allelism
Which blood group is an example of codominance and multiple allelism?
B
p.10
Examples of Genetic Crosses
What are the possible phenotypes from a cross between heterozygous blood group A and heterozygous blood group B?
D
p.10
Genotype and Phenotype Definitions
What is the genotype for blood group AB?
A
p.10
Genotype and Phenotype Definitions
Which allele is recessive in the ABO blood group system?
A
p.11
Sex-Linked Genes
What type of chromosome carries the gene for colour blindness in humans?
A
p.11
Sex-Linked Genes
What is the genotype of a female who is a carrier for colour blindness?
E
p.11
Sex-Linked Genes
Which of the following genotypes represents a colour blind male?
C
p.11
Sex-Linked Genes
What is the phenotype of a female with the genotype XBXB?
B
p.11
Sex-Linked Genes
Why can't males be heterozygous for colour blindness?
C
p.12
Sex-Linked Genes
What is the genotype of the carrier female in the example of haemophilia?
B
p.12
Sex-Linked Genes
Why are recessive sex-linked traits more common in males than in females?
D
p.12
Sex-Linked Genes
What is the phenotype of the male child who inherits the Xh allele from the carrier mother?
B
p.12
Sex-Linked Genes
In the genetic cross, what is the F1 ratio of the offspring phenotypes?
D
p.12
Sex-Linked Genes
What can be concluded about a man’s ability to pass on a sex-linked trait to his son?
