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15 Cards in this Set
- Front
- Back
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What is meant by the word Variation? |
Variation is the differences which are within a species. |
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Define discrete variation |
Variation which has distinct groups. It is controlled by alleles of a single gene or a small number of genes. |
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Define continuous variation |
Variation which has a range of values and often has to be measured. |
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Give 3 examples of discrete variation |
Blood type, eye colour, shoe size, hair colour, number of spots on a lady bird, flower colour, wrinkled of smooth peas, etc |
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Give 3 examples of continuous variation |
height, foot length, hand span, stem height, arm length, weight, etc. |
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Which type of variation is most common of an individuals phenotype? |
continuous |
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What is polygenic inheritance? |
When characteristics are controlled by two or more genes. |
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What is the term for two forms of the same gene? |
Alleles |
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What 2 terms can you use to describe alleles which are both the same. |
Homozygous or true breeding |
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What does heterozygous mean? |
When alleles are both different. |
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What does F1 represent? |
The first generation |
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If black coat (B) is dominant and golden coat (b) is recessive, what will the phenotype and genotype be of the F1 offspring if a true breeding black coat dog and a true breeding golden coat dog breed. |
Black coat and Bb |
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What does phenotype mean? |
The physical appearance of an individual |
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What genotype mean ? |
The genetic make up of an individual and is usually represented in symbols (BB) |
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Why do the offspring of crosses not always show the expected ratios? |
Because fertilisation is a random process and due to the random assortment of alleles |
