Q: A couple, both heterozygous for a recessive genetic disorder (Aa), are planning to have a child. What is the probability that their child will be affected by the disorder? Use the multiplication rule and a Punnett square to justify your answer.

$$P(aa) = P(Aa \text{ parent passes } a) \times P(Aa \text{ parent passes } a) = 0.5 \times 0.5 = 0.25$$

Q: A woman who is a carrier for an X-linked recessive disorder (X$$^NX$^n) $$and a man who is unaffected (X$$^NY) $$have a son. What is the probability that their son will have the disorder?

$$P(\text{affected son}) = 0.5$$

Q: If the probability of event A is $$0.4$$ and the probability of event B is $$0.3$$, what is the probability that both events occur, assuming they are independent?

$$P(A \text{ and } B) = 0.4 \times 0.3 = 0.12$$

Question 1

A researcher observes a cell with condensed chromosomes aligned at the center of the cell, with spindle fibers attached to each chromosome. Which phase of mitosis is this cell most likely in?

Accepted Answer

Metaphase

Question 2

Which of the following best explains why genetic variation is higher in sexually reproducing organisms compared to asexually reproducing organisms?

Accepted Answer

Sexual reproduction includes independent assortment, crossing over, and random fertilization.

Question 3

A human cell with 46 chromosomes undergoes mitosis. How many chromosomes will each daughter cell have after cytokinesis?

Accepted Answer

46

Question 4

A plant cell is observed forming a cell plate during cell division. This structure is most directly involved in which process?

Accepted Answer

Cytokinesis

Question 5

A couple, both heterozygous for a recessive genetic disorder (Aa), are planning to have a child. What is the probability that their child will be affected by the disorder? Use the multiplication rule and a Punnett square to justify your answer.

Accepted Answer

$$P(aa) = P(Aa 	ext{ parent passes } a) 	imes P(Aa 	ext{ parent passes } a) = 0.5 	imes 0.5 = 0.25$$

Question 6

Which of the following scenarios best illustrates the concept of pleiotropy?

Accepted Answer

A gene that determines flower color also affects seed shape.

Question 7

A woman who is a carrier for an X-linked recessive disorder (X$$^NX$^n) $$and a man who is unaffected (X$$^NY) $$have a son. What is the probability that their son will have the disorder?

Accepted Answer

$$P(	ext{affected son}) = 0.5$$

Question 8

During meiosis, homologous chromosomes fail to separate during anaphase I. What is the most likely result in the gametes produced?

Accepted Answer

Some gametes will have an extra chromosome, and some will be missing one (aneuploidy).

Question 9

A geneticist is mapping two genes and finds a recombination frequency of 12%. What is the distance between these genes on the chromosome?

Accepted Answer

$$12$$ map units (centimorgans)

Question 10

Which of the following best describes the Law of Independent Assortment?

Accepted Answer

Alleles for different genes segregate independently during gamete formation if they are on different chromosomes.

Question 11

A pedigree shows a trait that appears in every generation and affects both males and females equally. Which inheritance pattern is most likely?

Accepted Answer

Autosomal dominant

Question 12

A cell is exposed to a growth factor that stimulates cell division. Which checkpoint is most directly influenced by this signal?

Accepted Answer

G1 checkpoint

Question 13

In a dihybrid cross between two heterozygous pea plants (YyRr × YyRr), what is the expected phenotypic ratio among the offspring?

Accepted Answer

$$9:3:3:1$$

Question 14

A patient is diagnosed with Down syndrome. Which chromosomal abnormality is most likely responsible for this condition?

Accepted Answer

Trisomy 21

Question 15

A scientist observes that a certain gene is only expressed when another gene is present in a specific form. This is an example of:

Accepted Answer

Epistasis

Question 16

Which of the following best explains why females are less likely than males to express X-linked recessive disorders?

Accepted Answer

Females have two X chromosomes, so a normal allele can mask the effect of a recessive allele.

Question 17

A cell is observed to stop dividing when it becomes surrounded by other cells. This phenomenon is known as:

Accepted Answer

Density-dependent inhibition

Question 18

A man with blood type AB and a woman with blood type O have a child. What are the possible blood types of their child?

Accepted Answer

A or B

Question 19

A genetic disorder is caused by a deletion of a segment on chromosome 5. Which syndrome is most likely associated with this chromosomal alteration?

Accepted Answer

Cri du chat syndrome

Question 20

If the probability of event A is $$0.4$$ and the probability of event B is $$0.3$$, what is the probability that both events occur, assuming they are independent?

Accepted Answer

$$P(A 	ext{ and } B) = 0.4 	imes 0.3 = 0.12$$

Question 21

A cell with a duplicated chromosome segment is most likely to have which type of chromosomal alteration?

Accepted Answer

Duplication

Cell Division, Genetics, and Chromosomal Inheritance: Study Notes for General Biology

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드