Question 1

Which of the following best describes the difference between a gene and an allele?

Accepted Answer

A gene is a specific sequence of DNA that codes for a protein, while an allele is a variant form of that gene.

Question 2

In a dihybrid cross between two heterozygous parents (AaBb x AaBb), what is the expected phenotypic ratio of the offspring, assuming independent assortment?

Accepted Answer

$$9:3:3:1$$

Question 3

Which of the following best explains the difference between homologous chromosomes and sister chromatids?

Accepted Answer

Homologous chromosomes are pairs of chromosomes with the same genes but possibly different alleles, while sister chromatids are identical copies of a single chromosome joined at the centromere.

Question 4

A test cross is performed by crossing an individual with an unknown genotype to which of the following?

Accepted Answer

A homozygous recessive individual

Question 5

Which of the following statements about X-linked recessive inheritance is correct?

Accepted Answer

Males are more likely to express X-linked recessive traits because they have only one X chromosome.

Question 6

In a $$	ext{chi}^2$$ test, what is the purpose of the null hypothesis?

Accepted Answer

To state that there is no significant difference between observed and expected results

Question 7

Which of the following best describes the difference between haploid and diploid cells?

Accepted Answer

Haploid cells contain one set of chromosomes, while diploid cells contain two sets.

Question 8

A woman who is homozygous for a dominant allele at two genes (AA BB) marries a man who is homozygous recessive at both genes (aa bb). What will be the genotype of all their F1 offspring?

Accepted Answer

All will be heterozygous at both loci: Aa Bb

Question 9

Which of the following best explains the difference between independent assortment and segregation of homologs during meiosis?

Accepted Answer

Segregation refers to the separation of homologous chromosomes, while independent assortment refers to the random orientation of chromosome pairs during metaphase I.

Question 10

A student is using a compound light microscope and notices that the image is blurry at high magnification. Which of the following is the most likely cause and solution?

Accepted Answer

The fine focus knob needs to be adjusted to sharpen the image.

Question 11

Which of the following is a correct statement about the use of a hemacytometer to estimate cell concentration?

Accepted Answer

You should only count cells that are within the boundaries of the defined squares and not those touching the right or bottom lines.

Question 12

In a $$	ext{chi}^2$$ test, which formula is used to calculate the test statistic?

Accepted Answer

$$\$$chi^2$$ = \sum \frac{(O - E)^2$}{E}$$

Question 13

A man with red-green color blindness (an X-linked recessive trait) and a woman with normal vision (whose father was color blind) have a son. What is the probability that their son will be color blind?

Accepted Answer

$$0.5$$

Question 14

Which of the following best describes the difference between heterozygous and hemizygous genotypes?

Accepted Answer

Heterozygous means having two different alleles at a locus, while hemizygous means having only one allele at a locus (as in males for X-linked genes).

Question 15

Which of the following is an example of a complementation test?

Accepted Answer

Crossing two mutants with the same phenotype to determine if the mutations are in the same gene or different genes.

Question 16

Which of the following best describes the difference between metaphase I and metaphase II of meiosis?

Accepted Answer

In metaphase I, homologous chromosomes align at the metaphase plate; in metaphase II, sister chromatids align at the metaphase plate.

Question 17

A scientist is using a micropipettor to measure 10 $$\muL of $$solution. Which of the following is a common error that could lead to inaccurate measurement?

Accepted Answer

Not pressing the plunger to the first stop before drawing up the liquid.

Question 18

Which of the following best describes the difference between a null hypothesis and an alternative hypothesis in genetics experiments?

Accepted Answer

The null hypothesis states there is no effect or difference, while the alternative hypothesis states there is an effect or difference.

Question 19

Which of the following best explains why independent assortment does not apply to genes located close together on the same chromosome?

Accepted Answer

Genes that are close together on the same chromosome tend to be inherited together due to genetic linkage.

Genetics Exam Study Guide: Key Concepts, Methods, and Problem-Solving Strategies

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