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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Apply Evolutionary Thinking Botanists estimate that half or more of angiosperm species may be polyploids that arose initially through hybridization. Polyploidy—having more than a diploid set of the parental chromosomes—can result from nondisjunction of homologous chromosomes during meiosis, or when cytokinesis fails to occur in a dividing cell. Hybridization is the successful mating of individuals from two different species. Such an interspecific hybrid is likely to be sterile because it has uneven numbers of parental chromosomes, or because the chromosomes are too different to pair during meiosis. A sterile hybrid may reproduce asexually, however, and if by chance its offspring should become polyploid, that plant will be fertile because the original set of chromosomes will have homologs that can pair normally during meiosis. Explain why both the hybrid parent and fertile polyploid offspring may be considered a new species.

Summary Introduction

To review:

The reasons for which the hybrid parent and fertile polyploid offspring are considered as new species.

Introduction:

Polyploidy is the condition in which there are more than one set of chromosomes present in the organism. The causes of polyploidy can be non-disjunction of homologous chromosomes, failure of cytokinesis, or hybridization. Hybridization is the mating of organisms that belong to two different species and produces sterile or in some rare cases fertile offspring.

Explanation

The hybrid plants are the result of the mating of individuals from two different species, that is hybridization and it is different from the usual breeding. The hybrids are different from the usual offspring and hence, reproductively isolated from the parent species leading to speciation and thus, forms new species...

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