Modern Understandings of Inheritance

Chapter 21 Introduction – Modern Understandings of Inheritance

Chromosomes are threadlike nuclear structures consisting of DNA and proteins that serve as the repositories for genetic information. The chromosomes depicted here were isolated from a fruit fly’s salivary gland, stained with dye, and visualized under a microscope. Akin to miniature bar codes, chromosomes absorb different dyes to produce characteristic banding patterns, which allows for their routine identification. (credit: modification of work by “LPLT”/Wikimedia Commons; scale-bar data from Matt Russell)


Electron micrograph shows a long, thin chromosome that has a banding pattern.

The gene is the physical unit of inheritance, and genes are arranged in a linear order on chromosomes. Chromosome behavior and interaction during meiosis explain, at a cellular level, inheritance patterns that we observe in populations. Genetic disorders involving alterations in chromosome number or structure may have dramatic effects and can prevent a fertilized egg from developing.

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Biology 110 PSU Dubois by OpenStax Biology 2nd Edition is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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