Q: Which equation represents the multiplication rule for calculating the probability of two independent events occurring together?

$$P(A \text{ and } B) = P(A) \times P(B)$$

Question 1

Which event during meiosis is illustrated by the random alignment of homologous chromosomes at metaphase I, as shown in the first image, and what is its significance?

Accepted Answer

Independent assortment; it increases genetic variation among gametes.

Question 2

The second image shows homologous chromosomes forming a bivalent with chiasmata. What process does this represent, and what is its outcome?

Accepted Answer

Crossing over; exchange of genetic material between homologous chromosomes.

Question 3

Which of the following best explains why fertilization, as shown in the third image, contributes to genetic variation?

Accepted Answer

Fertilization is a random process, combining two unique gametes to form a zygote.

Question 4

Gregor Mendel's experiments with pea plants disproved the blending hypothesis. Which observation from his experiments directly contradicted blending?

Accepted Answer

Traits reappeared unchanged in the F2 generation after skipping a generation.

Question 5

If a pea plant has the genotype 'Aa', what is its genetic condition?

Accepted Answer

Heterozygous

Question 6

According to Mendel's law of segregation, what happens to alleles during gamete formation?

Accepted Answer

Alleles are separated so that each gamete receives only one allele for each gene.

Question 7

A father is heterozygous (Aa) and a mother is homozygous recessive (aa) for albinism. What is the probability that their child will be albino?

Accepted Answer

$$\frac{1}{2}$$

Question 8

In a cross between two heterozygous individuals (Aa x Aa), what is the expected ratio of dominant to recessive phenotypes in the offspring?

Accepted Answer

$$3:1$$

Question 9

Which equation represents the multiplication rule for calculating the probability of two independent events occurring together?

Accepted Answer

$$P(A 	ext{ and } B) = P(A) 	imes P(B)$$

Question 10

If green seeds (G) are dominant over yellow seeds (g), and a plant with green seeds is crossed with a plant with yellow seeds, which genotype would result in all green-seeded offspring?

Accepted Answer

GG x gg

Question 11

Which blood type is possible for a child if the mother is type B and the father is type O?

Accepted Answer

Type O

Question 12

A cactus plant with genotype Ss displays long spines in complete dominance. What would the phenotype be in incomplete dominance?

Accepted Answer

Intermediate length spines

Question 13

Which inheritance pattern is illustrated when both alleles are equally expressed in the phenotype, such as in blood type AB?

Accepted Answer

Codominance

Question 14

In polygenic inheritance, if three genes (A, B, C) contribute pigment, what would be the pigment contribution of the genotype AaBbCc compared to AABbcc?

Accepted Answer

AaBbCc contributes the same amount of pigment as AABbcc.

Question 15

Which scenario best illustrates epistasis?

Accepted Answer

A gene for pigment color is masked by a gene for pigment deposition, resulting in albino mice regardless of color gene.

Question 16

Which environmental factor can alter the phenotype of an organism without changing its genotype?

Accepted Answer

Sunlight affecting skin tone

Question 17

A Himalayan rabbit develops black fur where an ice pack is applied. What does this demonstrate about gene expression?

Accepted Answer

Gene expression can be influenced by temperature.

Question 18

Which human disorder is caused by a mutation in the hemoglobin allele and provides resistance to malaria in heterozygotes?

Accepted Answer

Sickle cell anemia

Question 19

Why are dominant genetic disorders, such as Huntington's disease, less common than recessive disorders?

Accepted Answer

Dominant disorders cannot 'hide' in carriers and are more likely to be eliminated from the population.

Genetic Variation, Mendelian Genetics, and Extensions of Mendelian Inheritance

Study Guide - Practice Questions

Study Guide - Flashcards