Single-gene inheritance - Some genes discovered by observing segregation ratios
7 important questions on Single-gene inheritance - Some genes discovered by observing segregation ratios
What is one general aim of genetic analysis today?
Mutant alleles can be either dominant or recessive, depending on their action; so the question of dominance needs to be considered in the analysis. What is the standard procedure?
Type of grid showing gametes and gametic fusions.
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1:1 ratio
The ratio is the same within males and females, within the bounds of sampling error. From these results, the “short wings” mutant was very likely produced by a dominant mutation. Note that, for a dominant mutation to be expressed, only a single “dose” of mutant allele is necessary; so, in most cases,when the mutant first shows up in the population, it will be in the heterozygous/homozygous state.
Are dominant mutations represented by uppercase letters or words?
Sometimes, the severity of a mutant phenotype renders the organism sterile, unable to go through the sexual cycle. How can the single-gene inheritance of sterile mutants be demonstrated?
What if a cross between a mutant and a wild type does not produce a 3 :1 or a 1:1 ratio, but some other ratio?
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