Question 1

Which process is responsible for halving the chromosome number in gametes, ensuring genetic continuity across generations?

Accepted Answer

Meiosis

Question 2

A diploid cell (2n) undergoes meiosis to produce gametes. If the diploid number is 8, how many chromosomes will each gamete contain?

Accepted Answer

$$4$$

Question 3

Homologous chromosomes:

Accepted Answer

Have the same shape and gene loci but may carry different alleles

Question 4

An individual with genotype $$Bb$$ for a particular gene is:

Accepted Answer

Heterozygous

Question 5

Which of the following best describes phenotypic plasticity?

Accepted Answer

The ability of an organism to express different phenotypes under different environmental conditions

Question 6

A child has blood type AB, but neither parent is type AB. Which inheritance pattern explains this?

Accepted Answer

Codominance

Question 7

In a cross between two heterozygous rabbits for two unlinked traits (AaBb x AaBb), what is the expected phenotypic ratio in the offspring?

Accepted Answer

$$9:3:3:1$$

Question 8

Which of the following is an example of a polygenic trait in humans?

Accepted Answer

Skin color

Question 9

A pedigree shows a trait appearing in both sexes with equal frequency and skipping generations. What is the most likely inheritance pattern?

Accepted Answer

Autosomal recessive

Question 10

A woman who is a carrier for red-green color blindness (X$$^NX$^n) $$has children with a man with normal vision (X$$^NY). $$What is the probability that a son will be colorblind?

Accepted Answer

$$0.25$$

Question 11

Which formula is used to calculate the chi-squared statistic in genetics?

Accepted Answer

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

Question 12

If the calculated chi-squared value for a genetic cross is $$4.76$$ and the critical value at $$df=3 is$$ $$7.815$$, what is the correct conclusion?

Accepted Answer

There is no significant difference; genes are likely unlinked

Question 13

Which of the following best explains why males are more likely to express X-linked recessive traits?

Accepted Answer

Males have only one X chromosome, so a single recessive allele will be expressed

Question 14

Which scenario demonstrates incomplete dominance?

Accepted Answer

A red-flowered plant crossed with a white-flowered plant produces pink-flowered offspring

Question 15

Which statement about SNPs (single nucleotide polymorphisms) is correct?

Accepted Answer

SNPs are single base changes that can increase genetic variation

Question 16

Which of the following is true about linked genes?

Accepted Answer

They are located close together on the same chromosome and tend to be inherited together

Question 17

A population has three alleles for a gene: $$A$$, $$B$$, and $$O. If an $$individual inherits $$A$$ from one parent and $$B$$ from the other, what is their blood type?

Accepted Answer

Type AB

Question 18

Which of the following best describes the law of independent assortment?

Accepted Answer

Alleles for different genes segregate independently if their loci are on separate chromosomes

Question 19

Which environmental factor is most strongly correlated with variation in human skin color according to anthropological studies?

Accepted Answer

UV radiation exposure

Question 20

A geneticist observes a bell-shaped distribution of phenotypes for a trait in a population. What type of inheritance is most likely responsible?

Accepted Answer

Polygenic inheritance

Genetics Study Notes: Patterns of Inheritance and Chromosomal Basis

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