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Criado por Aaron Clarke
mais de 10 anos atrás
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Questão | Responda |
Interspecific | |
The kind of variation between two daises in a field | Intraspecific |
Two reasons samples taken may not be representative of the whole | 1. Sample bias 2. Chance |
How can misrepresentation be avoided? | Eliminate human involvement in the collection of samples. (Random Sampling) |
How can we minimize chance in the sampling process? | 1.Use a large sample size. 2. Analysis of data collected. |
How do those two things minimise the effect of chance? | 1. The greater the sample size, the more reliable the data. 2. Statistical tests help to see if variation is cause by chance or by something else... |
Two factors that result in variation | 1. Genetic differences 2. Environmental Influences |
Mutation | A sudden change in genes or chromosomes that may be passed on. |
Which cells are made by meiosis? | Gametes |
How does fusion of gametes at fertilisation increase genetic variability? | 1. Offspring inherit characteristics from EACH parent. 2. Which gamete fuses with which is a random process. |
How is variation introduced in asexually reproducing organisms? | Only by mutation. Sexually reproducing organisms use mutations, meiosis and fusion of gametes. |
Relationship between a plant's genes an its environment. | Environment affects the way that genes are expressed. |
Four environmental factors that could influence a plant's development | 1.Climatic conditions. 2.Soil conditions 3.pH 4.Food availability. |
Why are conclusions about individuals in variation difficult? | Because it's hard to distinguish between the effects of the many genetic and environmental influences that make differences in individuals. |
Features of Genetic Factors | A few distinct forms, no intermediate types. |
Example | The ABO grouping for blood types. |
Genetic=caused by many different genes? | No Only one |
Effect of the environment | Little effect |
Features of environmental factors | Some characteristics grade into one another, forming a continuum. |
Examples | 1. Height 2. Mass |
Many genes in environmental? | Yes Polygenes |
Bell shaped curve on graph | Normal Distribution Curve |
On Normal Distribution Curve, what does the mean measure? | Provides an average value. (measurement at the maximum height of the curve). |
What does the standard deviation measure? | Indication of the range of values at either side of the mean. (Measure of the width of the curve). |
What is the point of inflection? | Distance from the mean to the point where the curve changes. |
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