Problem 16 Why would having the same invers... [FREE SOLUTION]

Chapter 13: Problem 16

Why would having the same inversion on both members of a homologous chromosome pair not lead to unbalanced gametes, as having only one inverted chromosome would?

Short Answer

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Having the same inversion on both members of a homologous chromosome pair results in balanced gametes because the chromosomes can align correctly and perform normal cross over during meiosis. However, having only one inverted chromosome results in unbalanced gametes because the chromosomes are not matching, and hence cannot align properly during crossing over in meiosis, leading to the formation of unbalanced, and often, unviable gametes.

Step by step solution

Understanding Chromosomal inversion

Chromosomal inversion is a mutation that flips a segment of chromosome 180 degrees within the same chromosome. In other words, it reverses the order of genes on a particular segment of the chromosome but does not involve gain or loss of genetic material. Two types of inversions exist, namely paracentric (does not include centromere) and pericentric (includes centromere).

Comprehend Homologous Chromosome Pair

A homologous chromosome pair is a pair of chromosomes that have the same gene sequence, loci, chromosomal length, and centromere location. One chromosome is inherited from the mother (maternal), the other from the father (paternal). The term homologous refers to those pairs of genes where each one carries the same set of linked genes, but possibly different alleles or gene forms.

Grasp the Implications of Inversions

Having the same inversion on both members of a homologous chromosome pair means both chromosomes have the same arrangement. During meiosis (specifically Prophase I), homologous chromosomes pair up and exchange segments in a process called crossing over. If both chromosomes have the same inversion, they are still able to line up and swap equivalent pieces of DNA allowing for balanced gametes. However, if only one chromosome has the inversion, mispairing happens during meiosis creating unbalanced gametes ultimately leading to a high percentage of unviable offspring.

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Why would having the same inversion on both members of a homologous chromosome pair not lead to unbalanced gametes, as having only one inverted chromosome would?

Short Answer

Step by step solution

Understanding Chromosomal inversion

Comprehend Homologous Chromosome Pair

Grasp the Implications of Inversions

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