For the following five questions, A = true, and B = false 18. (2 pts) The dominance of an allele may vary for different traits. 19. (2 pts) Loss-of-function alleles are recessive, not dominant. 20. (2 pts) A haplosufficient allele is able to produce a wild-type phenotype in the heterozygous state. 21. (2 pts) The permissive temperature, which is usually lower than the normal growth temperature, is the temperature at which a mutant phenotype becomes observable. 22. (2 pts) In a cross between two true-breeding recessive mutants that are affected in different genes, the proportion of F1 progeny that show complementation (the wild-type phenotype) is affected by the map distance between the two genes.

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