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MC - Genetics
Multicellular Organisms - Genetics
| Question | Answer |
|---|---|
| What is an allele? | Different forms of the same gene |
| What is a phenotype? | The physical appearance due to genetic trait |
| What is a genotype? | the 2 alleles present e.g. BB or bb or Bb |
| How many dominant alleles do you need to allow the dominant phenotype to show | One |
| How many recessive alleles do you need to allow the recessive phenotype to show | Two |
| What is homozygous? | Two of the same alleles (e.g. BB or bb) |
| What is heterozygous? | Two different alleles (e.g. Bb) |
| What are the names for the generations in a family tree? | P, F1 and F2 |
| Why are predicted ratios of offspring not always the observed ratio? | Fertilisation is a random process. |
| Define discrete variation. | A characteristic that can be split up into groups. |
| Define continuous variation. | A characteristic that shows a wide range or variation. |
| Tongue rolling is a characteristic split up into groups, is this an example of a discrete or continuous variation? | Discrete |
| Height is a characteristic that shows a wide range of values, is this an example of discrete or continuous variation? | Continuous |
| Which type of graph would represent a continuous characteristic? | Line graph |
| Which type of characteristic would represent a discrete characteristic? | Bar graph |
| Define polygenic inheritance | A characteristic controlled by more than one gene |
| Is continuous or discrete variation an example of polygenic inheritance? | Continuous |
| Is the term blue eyes a genotype or a phenotype? | Phenotype |
| Are the letters Bb a genotype or a phenotype? | Genotype |
| Single gene inheritance is shown by which type of variation? | Discrete |
| State the only genotype that will show a recessive characteristic. | bb (two small letters) |
| If two dominant parents have a recessive child, are they heterozygous or homozygous? | Heterozygous (Bb) (This allows them both to pass on the small b) |
| If two heterozygous individuals are crossed, what is the predicted ratio of offspring? | 3 dominant : 1 recessive |
| Blood type is a characteristic split up into groups, is this an example of continuous or discrete variation? | Discrete |
| State the term for different versions of the same gene? | Allele |
| State the term for a characteristic controlled by more than one gene | Polygenic |
| What is a gene | A section of a chromosome that codes for a characteristic |
| If a homozygous dominant individual was crossed with a recessive individual, what percentage show a dominant phenotype? | 100% |
| If a heterozygous individual was crossed with a recessive individual, what percentage show a recessive phenotype? | 50% |
Created by:
StNiniansHS
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