BRAINCAKEPolyploidy and Hybrids
Modern varieties of wheat are the result of hybridisation of different varieties of wheat over 10,000 years.
Hybridisation is the combining of genes of different varieties or species of organism to produce polyploid hybrids..
Polyploidy may arise if chromosomes do not separate into two distinct sets during meiosis. Zygotes from the fertilised gametes will therefore have 3 or more sets of chromosomes..
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Key terms in this lesson
- gene
- A length of DNA that codes for a polypeptide or a functional RNA molecule, at a specific locus on a chromosome.
- homologous chromosomes
- A pair of chromosomes, one from each parent, that carry the same genes at the same loci but may carry different alleles.
- meiosis
- A type of nuclear division that produces four genetically different haploid daughter cells (gametes) from a diploid parent cell.
- species
- A group of organisms with similar characteristics that can interbreed to produce fertile offspring.
More in Genetic Diversity
- Chromosome Mutations
- Gene Mutations
- Substitution of Bases
- Deletion of Bases
- Meiosis
- The Process of Meiosis
- Genetic Recombination by Crossing Over
- Independent Segregation of Chromosomes
All 19 lessons in Genetic Diversity · All AQA AS-level Biology topics