Question 1

Which of the following best explains why sexual reproduction is advantageous in changing environments compared to asexual reproduction?

Accepted Answer

Sexual reproduction increases genetic variation, allowing populations to adapt to new challenges.

Question 2

A diploid cell has a DNA content of $$x in G1 $$phase. What is the DNA content of a single cell at anaphase of meiosis I?

Accepted Answer

$$0.5x$$

Question 3

Which event during meiosis is primarily responsible for generating new combinations of alleles on the same chromosome?

Accepted Answer

Crossing over during prophase I

Question 4

If an organism has $$2N = 16$$ chromosomes, how many different gamete types can be produced based on independent assortment alone (ignoring crossing over)?

Accepted Answer

$$256$$

Question 5

Which of the following best describes homologous chromosomes?

Accepted Answer

They are chromosomes that carry the same genes but may have different alleles.

Question 6

During which stage of meiosis are tetrads present?

Accepted Answer

Metaphase I

Question 7

A man and a woman both have straight hair lines (recessive trait). Assuming no new mutations, what is the probability that they will have a child with a widow’s peak (dominant trait)?

Accepted Answer

0%

Question 8

A child has freckles (dominant trait), but the mother does not. What are the possible genotypes of the father?

Accepted Answer

He could be either homozygous dominant (FF) or heterozygous (Ff).

Question 9

How many unique gametes can be produced through independent assortment by an individual with the genotype $$AaBbCCDdEe$$?

Accepted Answer

$$16$$

Question 10

Which of the following is a cross between F1 monohybrids?

Accepted Answer

Rr x Rr

Question 11

In a cross $$AaBbCc 	imes AaBBCc$$, what is the probability of producing the genotype $$AABbCc$$?

Accepted Answer

$$\frac{1}{8}$$

Question 12

Which of the following best explains why there is no DNA replication between Meiosis I and Meiosis II?

Accepted Answer

DNA replication would double the chromosome number, preventing gamete formation.

Question 13

Which of the following is a function of the recombination nodule during meiosis?

Accepted Answer

It facilitates crossing over between homologous chromosomes.

Question 14

Which of the following is NOT a unique event in Meiosis I that leads to genetic variation in gametes?

Accepted Answer

Separation of sister chromatids

Question 15

Why are garden peas considered good model organisms for genetic studies?

Accepted Answer

They produce many offspring, have easily observable traits, and can self- or cross-pollinate.

Question 16

Which of the following best defines a gene?

Accepted Answer

A sequence of DNA that codes for a specific protein or trait

Question 17

Which of the following best describes the difference between genotype and phenotype?

Accepted Answer

Genotype is the genetic makeup; phenotype is the observable trait.

Question 18

Which of the following explains how meiosis accounts for Mendel’s law of segregation?

Accepted Answer

Homologous chromosomes separate during meiosis I, so each gamete receives only one allele for each gene.

Question 19

A testcross is performed to determine the genotype of a pea plant with purple flowers (dominant phenotype). Which result would indicate the plant is heterozygous?

Accepted Answer

Some offspring have white flowers.

Question 20

In snapdragons, red flowers ($$RR) $$crossed with white flowers ($$rr) $$produce pink flowers ($$Rr) $$due to incomplete dominance. If a pink snapdragon is crossed with a red snapdragon, what are the expected phenotypes of the offspring?

Accepted Answer

1 red : 1 pink

Meiosis, Sexual Reproduction, and Mendelian Genetics Study Guide

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