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Chapter 8: Problem 9

Explain why inversions and reciprocal translocations do not usually cause a phenotypic effect. In a few cases, however, they do. Explain how.

Short Answer

Expert verified
Inversions and reciprocal translocations typically don't cause a phenotypic effect because they don't result in loss or gain of vital genetic material, only rearrangement. However, they can cause a phenotypic effect if they disrupt a vital gene or result in incorrect gene expression, or lead to aberrant gametes resulting in genetic diseases in offspring.

Step by step solution

01

Understanding Chromosomal Alterations

Inversions and reciprocal translocations are two types of chromosome alterations. An inversion is a chromosome rearrangement that occurs when a segment of a chromosome is reversed end to end. A reciprocal translocation occurs when two different chromosomes exchange pieces, resulting in rearrangement of genes.
02

Explaining the Effect on Phenotype

Generally, inversions and reciprocal translocations don't cause any phenotypic effect because they don't cause loss or gain of vital genetic material. They only change the arrangement of the genes. In a normal scenario, all genes are present and functional even after these rearrangements. So, the genetic information is still the same, leading to normal development and function.
03

Describing Exceptions

While inversions and reciprocal translocations usually don't cause a phenotypic effect, if they disrupt a vital gene or involve a gene that controls development, they can cause abnormalities or diseases. For instance, if a translocation break occurs in the middle of a gene and disrupts its function, or if it positions genes in new contexts where they are incorrectly expressed. Moreover, these alterations can lead to aberrant gametes following improper pairing and crossing over during meiosis, potentially resulting in offspring with genetic diseases.

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Most popular questions from this chapter

How does a chromosomal duplication occur?

Explain why a translocation cross occurs during metaphase of meiosis I when a cell contains a reciprocal translocation.

Explain why small deletions and duplications are less likely to have a detrimental effect on an individual's phenotype than large ones. If a small deletion within a single chromosome happens to have a phenotypic effect, what would you conclude about the genes in the region affected by the deletion?

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