1. What best describes multiple allelism at a gene locus?
2. In a single-gene lethal-allele scenario, why can an expected 3:1 offspring ratio shift to 2:1?
3. What amount of functional protein is associated with the dominant phenotype in the simple example of protein P?
Single-gene variations — types?
Incomplete dominance, codominance, lethal alleles, multiple alleles.
Protein dominance — threshold?
≥50% functional protein causes dominant phenotype.
Multiple alleles concept
More than two alleles possible at one gene locus.
Incomplete dominance
Intermediate phenotype in heterozygotes.
Codominance example
Both alleles expressed in heterozygotes.
Lethal alleles
Homozygous can cause death, heterozygous viable.
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