Polyploidy Origin and Types

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What is the result of hybridizing two closely related species?

Allopolyploidy (correct)
Polyploidization
Autopolyploidy
Aneuploidy

What is the main reason why a hybrid plant may be sterile?

The plant has too many chromosomes
The plant has too few chromosomes
The chromosomes are not homologous and cannot synapse properly during meiosis (correct)
The plant has an odd number of chromosomes

What is an allotetraploid?

A polyploid containing the equivalent of six haploid genomes derived from separate species
A polyploid containing the equivalent of four haploid genomes derived from separate species (correct)
A polyploid containing the equivalent of two haploid genomes derived from the same species
A polyploid containing the equivalent of three haploid genomes derived from separate species

What is the difference between an allotetraploid and an amphidiploid?

An amphidiploid is a type of allotetraploid where the original species are known (D) Signup and view all the answers

Which of the following is an example of an amphidiploid plant?

Gossypium (cotton) (D) Signup and view all the answers

What is the key feature of the chromosomes in an allotetraploid plant?

The chromosomes are not homologous and cannot synapse properly during meiosis (D) Signup and view all the answers

What is the term used to describe a condition where an individual has more than two haploid sets of chromosomes?

Polyploidy (B) Signup and view all the answers

Which of the following syndromes is characterized by the presence of three copies of chromosome 13?

Patau syndrome (B) Signup and view all the answers

What is the term used to describe a condition where an individual is missing one or more chromosomes?

Deletion (A) Signup and view all the answers

Which of the following statements is true about autosomal monosomies?

They are rarely found, suggesting monosomic gametes may be functionally impaired. (D) Signup and view all the answers

What is the term used to describe a condition where an individual has three copies of a particular chromosome?

Trisomy (B) Signup and view all the answers

Which of the following statements is true about polyploidy in plants?

It is prevalent in plants. (D) Signup and view all the answers

What is autopolyploidy?

The addition of one or more sets of chromosomes from the same species (A) Signup and view all the answers

How can autotetraploidy arise?

All of the above (D) Signup and view all the answers

What is the role of colchicine in inducing autotetraploidy?

It inhibits mitosis by preventing tubulin polymerization (D) Signup and view all the answers

What is allopolyploidy?

The combination of chromosome sets from different species (A) Signup and view all the answers

Which of the following is NOT a characteristic of autopolyploidy?

It involves chromosome sets from different species (A) Signup and view all the answers

What is aneuploidy?

An abnormal number of chromosomes that is not a multiple of the haploid set (D) Signup and view all the answers