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33 lines
1.2 KiB
Markdown
33 lines
1.2 KiB
Markdown
---
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cards-deck: default_obsidian
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---
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#bio
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# Allele
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## definition
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#card/reverse
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A specific variation of a gene that produces a specific characteristic.
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^1652853823262
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## Encoding
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- For each characteristic, most organisms have ==two alleles==.
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^1652853823270
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- These alleles are most often passed on encoded in chromosomes; one from mom and one from dad.
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- some organisms have just one chromosome ==(haploid)== or multiple chromosomes ==diploid, triploid, tetraploid==
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- [[gametes]] only carry one allele/chromosome.
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### can be dominant or recessive.
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Dominant [[phenotype]] ::: at least one dominant allele.
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Recessive [[phenotype]] ::: both alleles are recessive.
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#### incomplete dominance
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ratio of 1:2:1, with the 2 showing a blend of the other two traits. If both are [[#^c5aafd|homozygous]].
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### Alleles can be matching or not
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Homozygous ::: Carries the same two alleles for a given characteristic.
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Heterozygous ::: Carries one of each alleles for a given characteristic. ^c5aafd
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You can tell which the parents are based off of offspring; if, for example, the offspring (3rd gen) carry the full diversity of the first generation, then the second-gen parents must necessarily be Heterozygous.
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