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MC - Genetics

Multicellular Organisms - Genetics

QuestionAnswer
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