A chromosome initially has the following segments: AB ·CDEFG...

A chromosome initially has the following segments: $$\underline{\mathrm{AB} \cdot \mathrm{CDEFG}}$$ Draw the chromosome, identifying its segments, that would result from each of the following mutations. a. Tandem duplication of DEF b. Displaced duplication of DEF c. Deletion of $\mathrm{FG}$ d. Paracentric inversion that includes DEFG e. Pericentric inversion of BCDE

A chromosome initially has the following segments: $$\underline{\mathrm{AB} \cdot \mathrm{CDEFG}}$$ Draw the chromosome, identifying its segments, that would result from each of the following mutations.
a. Tandem duplication of DEF
b. Displaced duplication of DEF
c. Deletion of $\mathrm{FG}$
d. Paracentric inversion that includes DEFG
e. Pericentric inversion of BCDE

Key Concepts

Pericentric Inversion

A pericentric inversion involves the inversion of a chromosomal segment that includes the centromere. This rearrangement alters the order of genes across both arms of the chromosome and can have significant effects on genetic stability, recombination, and overall chromosomal structure.

Chromosomal Deletion

Deletion is a type of chromosomal mutation where a segment of DNA is lost or removed from the chromosome. The absence of this genetic material can disrupt coding sequences or regulatory regions, potentially causing loss of gene function or other phenotypic changes.

Paracentric Inversion

A paracentric inversion is a chromosomal rearrangement in which a segment of a chromosome, excluding the centromere, is flipped in orientation. This inversion occurs within one arm of the chromosome and, while not changing the total amount of genetic material, can interfere with normal gene function and recombination processes.

Tandem Duplication

Tandem duplication is a chromosomal mutation in which a segment of DNA is copied and the duplicate is inserted immediately adjacent to the original sequence. This mutation results in two directly repeated copies of that segment, and it can lead to changes in gene dosage, potentially affecting the phenotype.

Displaced Duplication

Displaced duplication involves the replication of a segment of DNA with the duplicate inserted at a non-adjacent location in the chromosome. Unlike tandem duplication, the duplicated segment is translocated away from its original position, which can disrupt regulatory elements or gene order and lead to varied genetic consequences.

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