A plant line with reduced fertility comes to the attenti...

Question

A plant line with reduced fertility comes to the attention of a plant breeder who observes that seed pods often contain a mixture of viable seeds that can be planted to produce new plants and withered seeds that cannot be sprouted. The breeder examines numerous seed pods in the reduced fertility line and counts 622 viable seeds and 204 nonviable seeds.

What single-gene mechanism best explains the breeder's observation?

Accepted Answer

Hey, everyone. Let's take a look at this question together in a case where a wild type allele produces an enzyme with full activity and a mutant allele produces none at all. The mutant allele is what? So let's recall what we know about the relationship between enzyme activity and how an allele is expressed to try to figure out what the mutant allele is. But we know that when it comes to different alleles and their enzyme activity, we note that dominance is determined bye the protein products and those protein products of the alleles work to produce the, you know, type or that illegal. And in the case of enzyme activity, we know that very little enzyme activity would mean that the oil is recessive. However, in this case, our mutant allele produces no enzyme activity at all. So no enzyme activity we know represents a dominant. Oh Leo. So in the case of our mutant allele producing no enzyme activity, the mutant allele is answer choice a dominant because we know that dominance is determined by those protein products of the alleles which work to produce the phenotype. And in the case of no enzyme activity from that mutant allele it results in it being dominant. So answer choice A is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

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