31 lines
964 B
Markdown
31 lines
964 B
Markdown
[[G11 Pre-AP Biology]]
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Incomplete dominance is when neither allele is dominant, therefore a heterozygous will have intermediate phenotypes between that of its homozygous parents.
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Example being two flours homozygous red flowers and homozygous white flowers producing pink flowers.
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If you then breed these pink flowers together, there's 25% chance of red flowers, 25% chance for white flowers and 50% chance of pink flowers.
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Co dominance is when both alleles are dominant. Therefore a heterozygous will have both alleles fully expressed.
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For blood types, A and B are codominant, O is recessive.
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Example dihybrid cross begin:
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Let $I^a$ rep A blood allele. } codominant
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Let $I^a$ rep B blood allele. } ^
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Let i rep O blood allele. } recessive
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$P_1$: $I^AI^A * ii$
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Gamete: $I^A I^A * i i$
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$F_1$:
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| | $I^A$ | $I^A$ |
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| --- | ------ | ------ |
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| i | $I^A$i | $I^A$i |
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| i | $I^A$i | $I^A$i |
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Phenotypes:
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100% $I^Ai$
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Genotype:
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100% A blood.
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Example end. |