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Chapter 25: Problem 4

In general, why do changes in chromosome structure or number tend to affect an individual's phenotype? Explain why some changes in chromosome structure, such as reciprocal translocations, do not.

Short Answer

Expert verified
Changes in chromosome structure or number can affect an individual's phenotype because they can alter the number or function of genes, thus leading to different traits being expressed. However, some changes such as reciprocal translocations might not affect the phenotype as all genes are still present and can function normally. The impact on phenotype only occurs if the translocation disrupts a gene or alters its regulation.

Step by step solution

01

Understand Phenotypes and Chromosomes

A phenotype refers to the physical characteristics of an organism that are visible, such as height, eye color, and blood type. These traits are determined by genes, which are located on chromosomes. Therefore, changes in chromosome structure or number could potentially result in different traits being expressed.
02

Impact of Chromosome Changes on Phenotype

Changes in the structure or number of chromosomes can affect phenotype because they can result in a change in the number or function of genes. Examples of these changes include deletions (which eliminate one or more genes), duplications (which repeat a segment of the chromosome and the genes in that segment), inversions (which reverse the orientation of a segment), and translocations (which move a segment from one chromosome to another). These changes can lead to the expression of different traits and therefore affect the phenotype.
03

Explain Non-effect of Reciprocal Translocations

Reciprocal translocation refers to a situation where non-homologous chromosomes exchange parts. This doesn't necessarily affect the phenotype because all genes are still present and theoretically able to function normally. Since the overall genetic content does not change, the phenotype might not be altered unless the translocation disrupts a gene or alters its regulation.

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