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Incomplete Dominance

Incomplete Dominance

Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.

Multiple Allele Traits

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The Concept of Multiple Allelism

Epistasis

Epistasis

In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...

Polygenic Traits

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...

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Law of Independent Assortment

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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.

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Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations

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ACE ID genotype and leg power in Rugby Union players.

W Bell¹, J P Colley, J R Gwynne

¹University of Wales, Institute Cardiff, Cyncoed, Cardiff, Wales, UK. wbell@ uwic.ac.uk

The Journal of Sports Medicine and Physical Fitness

|September 16, 2010

Summary

Rugby players with the ACE ID genotype showed no significant leg power differences between forwards and backs. However, backs with the DD genotype exhibited greater displacement and velocity, impacting player performance.

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Area of Science:

Sports Science and Genetics
Human Physiology
Rugby Union Performance Analysis

Background:

The Angiotensin-Converting Enzyme (ACE) gene polymorphism (I/D) is investigated for its influence on athletic performance.
Understanding genetic variations in relation to positional demands (forwards vs. backs) in Rugby Union is crucial for player development.

Purpose of the Study:

To test if there are significant differences in leg power components between forwards and backs based on ACE (I/D) gene genotypes (ID and DD).
To analyze the distribution of ACE genotypes within Rugby Union player positions.

Main Methods:

Sixty-eight young adult Rugby Union players were genotyped for the ACE (I/D) polymorphism using polymerase chain reaction.
Leg power was assessed in 58 players via counter movement jump on a force platform, measuring force, power, displacement, and velocity.
Statistical analyses included chi-square for genotype distribution and independent t-tests for comparing positional groups.

Main Results:

No significant difference in ACE genotype distribution was found between forwards and backs.
For the ACE ID genotype, backs demonstrated significantly higher relative force and relative power compared to forwards.
For the ACE DD genotype, backs showed significantly greater displacement and velocity than forwards.

Conclusions:

Positional differences in leg power characteristics exist between Rugby Union forwards and backs, influenced by ACE (I/D) genotype.
These findings can inform training programs to optimize leg power for specific positional requirements and enhance player performance.