Question 1

Which of the following best explains why meiosis, rather than mitosis, is necessary for sexual reproduction in humans?

Accepted Answer

Meiosis reduces the chromosome number by half, ensuring that fertilization restores the diploid number.

Question 2

During which phase of meiosis does crossing over occur, and what is its significance?

Accepted Answer

Prophase I; it increases genetic variation by exchanging DNA between homologous chromosomes.

Question 3

A diploid cell with 8 chromosomes undergoes meiosis. How many chromosomes will each resulting gamete contain?

Accepted Answer

$$4$$

Question 4

Which of the following statements about Mendel’s principle of segregation is correct?

Accepted Answer

Alleles for a gene separate during gamete formation, so each gamete carries only one allele for each gene.

Question 5

In a monohybrid cross between two heterozygous pea plants ($$Pp 	imes Pp$$), what is the expected phenotypic ratio in the F2 generation if $$P is $$dominant to $$p$$?

Accepted Answer

$$3:1$$

Question 6

Which process is responsible for the independent assortment of genes observed by Mendel?

Accepted Answer

Random alignment of homologous chromosomes during metaphase I

Question 7

A plant with genotype $$Rr is $$crossed with a plant with genotype $$rr. $$What proportion of the offspring will be homozygous recessive?

Accepted Answer

$$1/2$$

Question 8

Which of the following best describes incomplete dominance?

Accepted Answer

The heterozygote expresses a phenotype intermediate between the two homozygotes.

Question 9

If a cell with genotype $$Aa$$ undergoes meiosis, what gametes can it produce, and in what proportion?

Accepted Answer

$$50\%$$ $$A$$ and $$50\%$$ $$a$$ gametes

Question 10

Which of the following is a real-world example of co-dominance?

Accepted Answer

A person with type AB blood expressing both A and B antigens on red blood cells.

Question 11

Which of the following events occurs during anaphase I of meiosis?

Accepted Answer

Homologous chromosomes separate and move to opposite poles.

Question 12

Why does sexual reproduction result in greater genetic diversity than asexual reproduction?

Accepted Answer

Because meiosis involves crossing over and independent assortment, creating new allele combinations.

Question 13

A true-breeding pea plant with round seeds ($$RR) is $$crossed with a true-breeding plant with wrinkled seeds ($$rr). $$What will be the genotype and phenotype of the F1 generation?

Accepted Answer

Genotype: $$Rr$$, Phenotype: all round seeds

Question 14

Which of the following best defines an allele?

Accepted Answer

Any of the alternative versions of a gene that may produce distinguishable phenotypic effects.

Question 15

Which of the following is NOT a difference between mitosis and meiosis?

Accepted Answer

Mitosis involves crossing over between homologous chromosomes; meiosis does not.

Question 16

In Mendel’s experiments, what was the genotypic ratio of the F2 generation in a monohybrid cross?

Accepted Answer

$$1:2:1$$

Question 17

Which of the following best describes the phenotype?

Accepted Answer

The observable physical and physiological traits of an organism.

Question 18

A genetic disorder is caused by a recessive allele. If two parents are both heterozygous for the disorder, what is the probability that their child will have the disorder?

Accepted Answer

$$1/4$$

Question 19

Which of the following is a direct result of the process shown in the third image (meiosis diagram)?

Accepted Answer

Production of four genetically unique haploid cells

Meiosis and Mendelian Inheritance: Mechanisms and Principles

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