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14 Cards in this Set
- Front
- Back
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Gene |
A sequence of bases on a DNA molecule that codes for a protein which results in a characteristic |
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Allele |
Different versions of a gene |
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Loci |
The fixed position in which an allele of a gene is found on each homologous chromosome |
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Genotype |
The different alleles that an organism has |
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Phenotype |
The expression of the genetic constitution and its interaction with the environment |
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Monohybrid Inheritance |
The inheritance of a characteristic controlled by a single gene |
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Phenotypic Ratio |
The ratio of different phenotypes in the offspring |
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Codominance |
Both alleles being expressed in the phenotype |
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Dihybrid Inheritance |
The inheritance of two characteristics, which are controlled by different genes |
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Why do males have the recessive phenotype if only one recessive allele of a sex linked gene is present? |
The Y chromosome is shorter so does not carry as many genes so males only have one allele for sex linked characteristics |
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Autosomal genes |
Genes linked on any chromosome that isn't a sex chromosome |
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Why are genes on the same autosome said to be linked? |
The genes will stay together during independent segregation and their alleles will be passed onto the offspring together |
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Epistasis |
The allele of one gene controlling the expression of another by masking it |
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When is the chi-squared test used in genetics? |
To test theories about the inheritance of characteristics |
