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Chapter 8: Problem 39

What is an allodiploid? What factor determines the fertility of an allodiploid? Why are allotetraploids more likely than allodiploids to be fertile?

Short Answer

Expert verified
An allodiploid is an organism with one set of chromosomes from two different species, with fertility determined by chromosome compatibility during meiosis. On the other hand, an allotetraploid contains two complete sets of chromosomes from each of two different species, and is more likely to be fertile because the extra set of chromosomes generally allows for proper pairing during meiosis.

Step by step solution

01

Understanding Allodiploids

An allodiploid is an organism that contains one set of chromosomes from two different species. In other words, one half of its genetic material comes from one species, and the other half comes from another species.
02

Fertility Determination in Allodiploids

The fertility of an allodiploid is determined by the compatibility of the two sets of chromosomes. If the chromosomes can pair up correctly during meiosis (cell division), then the organism will be fertile. If not, it will be sterile.
03

Understanding Allotetraploids

An allotetraploid is an organism that has two complete sets of chromosomes from each of two different species. It鈥檚 like being a hybrid, but with double the genetic material.
04

Fertility in Allotetraploids and Allodiploids

Allotetraploids are more likely to be fertile than allodiploids because the extra set of chromosomes usually allows for proper pairing during meiosis. Allodiploids often have problems with pairing because there is only one set of chromosomes from each species, which can lead to complications. On the other hand, allotetraploids have two sets of chromosomes from each species, increasing the chances of successful pairing and fertility.

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Most popular questions from this chapter

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

An inversion heterozygote has the following inverted chromosome: What would be the products if a crossover occurred between genes \(H\) and \(I\) on the inverted chromosome and a normal chromosome?

What is endopolyploidy? What is its biological significance?

Meiotic nondisjunction is much more likely than mitotic nondisjunction. Based on this observation, would you conclude that meiotic nondisjunction is usually due to nondisjunction during meiosis I or meiosis II? Explain your reasoning.

Meiotic nondisjunction usually occurs during meiosis I. What is not separating properly: bivalents or sister chromatids? What is not separating properly during mitotic nondisjunction?
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