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16.7: Summary

Last updated

Jan 21, 2020
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- 16.6: Linked Genes
- Back Matter

Ying Liu
City College of San Francisco

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Symbols are used to denote the alleles, or genotype, of a locus.
Phenotype depends on the alleles that are present, their dominance relationships, and sometimes also interactions with the environment and other factors.
In a diploid organism, the alleles can be homozygous, heterozygous or hemizygous.
Allelic interactions at a locus can be described as dominant vs. recessive, incomplete dominance, or co-dominance.
Two different genes can be on the same chromosome (linked) or on different ones (unlinked)
Steps:
- Can you identify the mutant? Name the gene after its phenotype
- If you cannot tell which allele is mutant, name the gene after the recessive allele
- Capitalize the first letter for the dominant allele; use lower-case for the recessive allele
- If genes are linked, write the gene symbols together on each side of the slash. If genes are unlinked, they appear on different sides of a semicolon

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