The flowering jungle plant Lacandonia schismatica, discovered in southern Mexico, has a unique floral structure. Petal-like organs are in the outer whorls surrounding a number of carpels, and stamens are in the center of the flower. Closely related species are dioecious; female plants bear flowers that resemble those of Lacandonia, but without the central stamens. What type of mutation could have resulted in the evolution of Lacandonia flowers?

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Hey, everyone. Let's take a look at this question. Together. The conversion of phenylalanine to tyrosine is carried out by an enzyme called fenny alanine hydroxylase. In individuals with pheno ketonuria, the P A H gene undergoes a mutation in which guanine is replaced by adenine. This mutation results in a stop codon being produced instead of the amino acid arginine leading to the formation of an incomplete and nonfunctional protein. What type of mutation is responsible for this alteration? Is it a missense mutation? A loss of function mutation? A frameshift mutation or a nonsense mutation? Let's work this problem out together to try to figure out what type of mutation is responsible for the stop codon being produced instead of the amino acid. So we can see that we have a mutation in which that guanine is replaced by the adenine. And so we have a mutation that results in the substitution of a base hair. And we know that a mutation that results in that substitution of one base pair for another is a point mutation, but more specifically, the mutation results in a stop codon being produced instead of an amino acid. And so we have this point mutation that results in the production of a stop codon, which a type of point mutation that results in the production of a stop codon is a nonsense mutation. And so this mutation that we have is a nonsense mutation. So answer choice d nonsense mutation is the correct answer. Since that P A H gene, which is that fenny alanine hydroxylase undergoes a mutation in which that guanine is substitute treated with adenine. And as a result of that mutation, a stop codon is produced instead of the amino acid arginine. And so we have a mutation that results in the substitution of a base pair, which is a point mutation, more specifically a type of point mutation that results in the production of a stop codon instead of an amino acid is called a nonsense mutation. So answer choice D is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

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Key Concepts

Mutation Types

Dioecy

Evolutionary Developmental Biology (Evo-Devo)