Question 1

Which of the following best describes the Law of Segregation in Mendelian genetics?

Accepted Answer

Homologous chromosomes are separated during meiosis, resulting in gametes that carry only one allele for each gene.

Question 2

A pea plant with genotype $Yy$ (Y = yellow pod, y = green pod) is self-pollinated. What is the expected ratio of phenotypes in the offspring?

Accepted Answer

$3$ yellow : $1$ green

Question 3

In a dihybrid cross between $TtYy$ and $TtYy$ pea plants (T = tall, t = short, Y = yellow, y = green), what is the expected ratio of offspring with both dominant phenotypes (tall and yellow)?

Accepted Answer

$9$ out of $16$

Question 4

Which principle explains why alleles for different traits are inherited independently of one another?

Accepted Answer

Principle of Independent Assortment

Question 5

A test cross is performed between a plant of unknown genotype and a homozygous recessive plant. If any offspring show the recessive phenotype, what can be concluded about the unknown parent?

Accepted Answer

The unknown parent must be heterozygous.

Question 6

Which of the following is an example of a deviation from Mendelian genetics?

Accepted Answer

Incomplete dominance, where the heterozygote shows an intermediate phenotype.

Question 7

If a pea plant with genotype $TTyy$ (T = tall, t = short, Y = yellow, y = green) is crossed with a plant with genotype $ttYY$, what will be the genotype of all F1 offspring?

Accepted Answer

$TtYy$

Question 8

Which statement about genotype and phenotype is correct?

Accepted Answer

Genotype is the genetic makeup, while phenotype is the observable trait.

Question 9

A plant with genotype $Pp$ (P = purple, p = white) is crossed with a plant with genotype $pp$. What percentage of the offspring will have purple flowers?

Accepted Answer

$50\%$

Question 10

Which of the following best describes the chromosomal basis for independent assortment?

Accepted Answer

Homologous chromosomes are separated randomly during meiosis I.

Question 11

In a cross between $RrYy$ and $rryy$ pea plants (R = round, r = wrinkled, Y = yellow, y = green), what is the expected proportion of offspring with wrinkled, green seeds?

Accepted Answer

$1/8$

Question 12

Which of the following is NOT a principle described by Mendel?

Accepted Answer

Law of Quantitative Inheritance

Question 13

A gene has three alleles: $A_1$, $A_2$, and $A_3$. Which of the following is true?

Accepted Answer

Each individual can have at most two alleles for this gene.

Question 14

Which scenario best illustrates polygenic inheritance?

Accepted Answer

Multiple genes contribute to a trait that varies along a continuum, such as human height.

Question 15

If a plant with genotype $Aa$ is crossed with another $Aa$ plant, what is the probability that an offspring will be homozygous recessive?

Accepted Answer

$1/4$

Question 16

Which of the following is a real-world example of environmental influence on gene expression?

Accepted Answer

Identical twins with the same genotype show differences in height due to nutrition.

Question 17

Which of the following best explains why alleles on the same chromosome may not assort independently?

Accepted Answer

They tend to be inherited together unless crossing-over occurs.

Question 18

In Mendel’s pea plant experiments, what was the observed ratio of purple to white flowers in the F2 generation?

Accepted Answer

$3$ purple : $1$ white

Question 19

Which of the following is true about a heterozygous genotype?

Accepted Answer

It contains two different alleles for a trait.

Question 20

A plant with genotype $YY$ (Y = yellow pod) is crossed with a plant with genotype $yy$ (y = green pod). What is the genotype and phenotype of all F1 offspring?

Accepted Answer

Genotype: $Yy$, Phenotype: yellow

Genetic Inheritance and Mendelian Principles: Structured Study Notes

Study Guide - Practice Questions

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