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Inheritance in tetraploid yeast revisited: segregation patterns and statistical power under different inheritance
M Stift1, R Reeve, P H van Tienderen
1Division of Ecology and Evolutionary Biology, University of Glasgow, Glasgow G12 8QQ, UK. m.stift@bio.gla.ac.uk
Journal of Evolutionary Biology
|June 8, 2010
Summary
Tetraploid yeast inheritance models were analyzed. The study found that while strict disomy is unlikely, disomic inheritance with imperfect pairing cannot be ruled out, necessitating larger sample sizes for definitive conclusions in Saccharomyces cerevisiae research.
Area of Science:
- Genetics
- Yeast Biology
- Evolutionary Biology
Background:
- Albertin et al. (2009) proposed an autotetraploid origin for Saccharomyces cerevisiae strains.
- Observed double reduction meiospores supported the autotetraploid hypothesis.
- Inheritance data presented by Albertin et al. appeared contradictory to a tetrasomic inheritance model.
Purpose of the Study:
- To clarify expected segregation ratios in tetraploid yeast under different inheritance models.
- To determine adequate sample sizes for distinguishing between disomic and tetrasomic inheritance.
- To re-evaluate the inheritance data of Albertin et al. (2009).
Main Methods:
- Overview of expected segregation ratios (tetrad and meiospore levels).
- Consideration of scenarios with and without recombination.
- Application of power analysis to determine sample size requirements.
Main Results:
- Strict disomic inheritance was rejected for most cases in the analyzed data.
- Disomic inheritance with strong, imperfect preferential pairing remained a possibility.
- Current sample sizes were insufficient to exclude this alternative model definitively.
Conclusions:
- Tetrad analysis in tetraploid yeast is a powerful tool for studying meiosis.
- Further investigation with larger sample sizes is needed to resolve inheritance models in Saccharomyces cerevisiae.
- Understanding tetraploid inheritance is crucial for yeast genetics and evolution.
Related Concept Videos
01:39Chromosomal Theory of Inheritance
In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”
01:49Law of Segregation
When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
02:03Law of Independent Assortment
While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
02:03Law of Independent Assortment
While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
01:18Dihybrid Crosses
Overview
02:27Trihybrid Crosses
Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...