Question 1

Which chromosomal mutation is responsible for Cri du Chat syndrome, and what is the primary genetic consequence of this mutation?

Accepted Answer

Deletion of the short arm of chromosome 5, resulting in loss of genetic material

Question 2

A horse with a palomino coat color is an example of which type of genetic inheritance?

Accepted Answer

Incomplete dominance

Question 3

Which of the following best describes a Robertsonian translocation?

Accepted Answer

Fusion of two acrocentric chromosomes resulting in one chromosome with two long arms and one with two short arms

Question 4

Gene duplication is considered a major source of evolutionary novelty because:

Accepted Answer

One copy can maintain the original function while the other is free to accumulate mutations

Question 5

Which equation correctly represents the probability of a child inheriting Down syndrome due to a Robertsonian translocation, assuming one parent is a carrier?

Accepted Answer

$$P = \frac{1}{4}$$

Question 6

A pericentric inversion differs from a paracentric inversion in that:

Accepted Answer

It includes the centromere within the inverted segment

Question 7

Which of the following is a likely consequence of a chromosomal deletion mutation?

Accepted Answer

Loss of genetic material and possible formation of a deletion loop

Question 8

If a gene family originated from a duplication event, which process most likely led to the functional diversification of its members?

Accepted Answer

Mutation and selection acting on the duplicated gene copies

Question 9

Which chromosomal abnormality is most commonly associated with trisomy in humans?

Accepted Answer

Trisomy 21 (Down syndrome)

Question 10

During meiosis, an individual heterozygous for a paracentric inversion may produce gametes with:

Accepted Answer

Duplications and deletions due to abnormal crossover events

Question 11

Which of the following best explains why palomino horses are not considered a distinct breed?

Accepted Answer

Palomino describes a coat color caused by a single cream gene on a chestnut base, not a breed

Question 12

Which of the following is a direct result of a duplication mutation?

Accepted Answer

Increase in gene dosage and potential for novel gene functions

Question 13

A chromosomal rearrangement that results in the exchange of genetic material between nonhomologous chromosomes is called:

Accepted Answer

Translocation

Question 14

Which of the following is most likely to occur if a chromosome fragment lacks a centromere after a Robertsonian translocation?

Accepted Answer

The fragment will be lost during cell division

Question 15

Which equation represents the number of possible gamete types produced by an individual heterozygous for a single inversion?

Accepted Answer

$$n = 4$$

Question 16

Which of the following is a key feature of HOX gene evolution?

Accepted Answer

HOX gene families arise through gene duplication and subsequent diversification

Question 17

Which chromosomal mutation is most likely to result in a change in gene order without altering the total amount of genetic material?

Accepted Answer

Inversion

Question 18

Which of the following is a common consequence of chromosomal rearrangements in plants?

Accepted Answer

Polyploidy leading to increased ecological and environmental diversity

Question 19

Which of the following best describes the formation of a deletion loop during meiosis?

Accepted Answer

It occurs when a chromosome with a deleted segment pairs with a normal homolog

Question 20

Which of the following is NOT a major type of chromosomal rearrangement discussed in the study materials?

Accepted Answer

Replication

Chromosome Mutations and Mapping: Study Notes for Genetics

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