• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Polygenic Lab

Extracts from this document...

Introduction

Introduction Human Height Polygenic traits are not expressed as absolute or distinct characters as was the case with Mendel's pea plant traits. Instead, polygenic traits are recognizable by their expression as a continuous variation. Height in humans is a polygenic trait. If you line up the entire class a range of variation is apparent, with an average height at the high point in the middle. Traits showing continuous variation are usually controlled by the additive effects of two or more separate gene pairs. This is what gives polygenic traits so many alleles and, therefore, so many genotypes. Usually polygenic traits are distinguished by traits usually quantified by measurement rather than counting, two or more gene pairs contributing to the phenotype, or phenotypic expression of polygenic traits varying over a wide range. ...read more.

Middle

So... If human height is a polygenic trait and polygenic traits have phenotypic variation, then human height should have a phenotypic variation. Human Ear Lobes If ear lobes are determined by a one gene trait and one gene traits have two alleles, then ear lobes are decided by two alleles making it have two genotypes. Data (Human Height) Biology class (period 3) Height (cm)(tens place) Height (cm)(ones place) 180 1,1,3 170 1,3,3,4,8 160 0,3,4,5,6,6,6,6,7,9 150 5,5,6,6,8 Biology class (period 1-3) Height (cm)(tens place) Height (cm)(ones place) Period 1 Period 2 Period 3 180 0,1,1 0,6,6,7,8,8 1,1,3 170 0,0,0,1,2,2,3,4,5,5,5 0,2,3,4,6,6,7 1,3,3,4,8 160 0,2,3,3,4,5,7,8,9,9 1,2,2,5,5,6,6,8,8,8,8 0,3,4,5,6,6,6,6,7,9 150 4,7,9 7,7 5,5,6,6,8 10 people Height (cm)(tens place) ...read more.

Conclusion

where a simple height gene has mutated and is present in many copies (alleles) and all alleles contributing to the height. There are so many alleles controlling this one trait that when they all get mixed up lots of outcomes are available. Human Ear Lobes My hypothesis that stated, if ear lobes are determined by a one gene trait and one gene traits have two alleles, then ear lobes are decided by two alleles making it have two genotypes, was true. If ear lobes are only determined by one gene then there are going to be two alleles. There is not a very big variation in the ear lobes because it is one gene trait, so no matter how you arrange the two alleles one is going to be dominant and one is going to be recessive, making only two outcomes. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Biology essays

  1. IB Genetic Unit Notes

    Found in Europe and US. Benefits: - damaged caused by insects are reduced - Bt corn is slightly more expensive, but the difference is less than on extra application of insecticide - Non- Bt corn needs to be checked often for signs of insects - therefore less checking of corn.

  2. Should Animals have the same rights as Humans? Both animals and humans exhibit behaviours ...

    The only way to deal with this problem is to break the association and condition the baby to go to sleep in its own cot by itself. Another type of conditioning is Trial and Error. This type of learning is also not unique to animals.

  1. Human variation

    18.5 161.0 19 20.2 159.2 7 19.0 168.4 20 20.2 165.0 8 19.0 163.0 21 20.3 164.0 9 19.0 157.5 22 20.5 168.5 10 19.0 166.5 23 20.5 170.0 11 19.0 164.3 24 20.5 167.0 12 19.0 172.5 25 21.0 172.0 13 19.1 172.2 26 21.5 175.5 Table 3.

  2. Biology Industrial Melanism of Peppered Moth Lab

    Number of Melanic Moths and Light-Coloured Moths left on Dark- Coloured "Tree Bark" Trial Number Number of Melanic Moths Number of Light-Coloured Moths 1 18 12 2 21 9 3 25 5 4 30 0 5 30 0 Qualitative Data On the light-coloured "tree bark" the predator often captured the

  1. Simpson Diversity Lab

    DATA COLLECTION: Table 1: Number of plant species found in both fields: Field Quadrat Species Rugby 1 - 10 dandelions (� 2) - 6 plantain (� 1) - 2 crab grass (� 1) - 4 unknown (� 1) 2 - 12 dandelions (� 2)

  2. Virtual Genetic Lab

    Parents: Blue Male (7) (Bb) x Blue Female (7) (Bb) gave offspring: Cage 9: 6 Blue Males; 8 Blue Females; 6 Pink Males; 2 Pink Females. In cage 9 the offspring of a blue male and blue female are both pink and blue therefore blue must be dominant where both of the parents are heterozygous (Bb).

  1. Comparing the Sexy Sons Hypothesis and the Pathogen Avoidance Models Effects on Sexual Selection

    This provides strong evidence for the pathogen avoidance model as it shows females selecting for environments where they and their eventual offspring are less susceptible to infection. The major limitation to this experiment however, was that it would have been a lot more informative if the researchers also used the

  2. Biotechnology Assignment: Genetic Screening/Testing

    There are concerns about privacy issues and gene patenting. The regulation of genetic tests available through the retail market comes under the jurisdiction of the Federal Government (i.e. Health Canada) but individual provinces also have their own influence. Some tests will be available through the healthcare system in some provinces

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work