Albinism, caused by a mutational disruption in melanin (skin pigm...

Question

Albinism, caused by a mutational disruption in melanin (skin pigment) production, has been observed in many species, including humans. In 1991, and again recently in 2017, the only documented observations of an albino humpback whale (named 'Migaloo') were observed near New South Wales. Recently, Polanowski and coworkers (Polanowski, A., S. Robinson-Laverick, and D. Paton. (2012). Journal of Heredity 103:130–133) studied the genetics of humpback whales from the east coast of Australia, including Migaloo.

Assuming that Migaloo's albinism is caused by a rare dominant gene, what would be the likelihood of the establishment of a natural robust subpopulation of albino white humpback whales in this population?

Accepted Answer

Hi everyone, welcome back, Here's our next question. It says achondroplasia is a condition in which the changing of cartilage to bone is prevented, it follows an autism, all dominant pattern of inheritance and affected individuals are characterized by dwarfism, which of the following is true about autism. All dominant disorders such as achondroplasia. Well, let's recall from our content videos what autism all dominant disorders are characterized by so that we can evaluate our statements and autism, aled genetic disorder is one where the gene is found on one of the 22, autism's not the two sex chromosomes, so therefore it's not sex linked. So that means males and females are equally likely to inherit the trait um whether it's dominant or recessive, it doesn't affect males and females in a different way. And of course dominant means an individual only needs to inherit one copy of the allele for the disorder to be affected by it. So let's look at our answer choices with that in mind. Keeping remembering that we're looking for a true statement. Choice A says it needs to affected genes from parents to be expressed. Well, this is not our answer because we only need one affected gene since it's a dominant disorder, um you only need to affected genes if it's a recessive disorder. Choice B is heterocyclic individuals are not affected but are carriers. Um Well, this is not true. This is only true of recessive disorders as well. Um And dominant disorders. A hetero six individual will have the disease since it is a dominant gene, recessive. Hetero six individual is a carrier of the gene since they can pass it on to their offspring, but they will not be affected by the disorder. Choice C says one affected gene is enough for the disorder to be expressed, and that is our correct answer again, since its dominant, an individual only needs to inherit one allele for the disorder to be affected by it. And finally, Choice D. Says it affects individuals who are homos I guess recessive. Um Well this is not true Choice D. Is not our answer, because in this case when the disorder is dominant, the recessive gene is the non affected gene, and so if your home is recessive, it means you haven't inherited the gene for the disorder and you're not affected by it. So again, um which of the following is true about autism. Will dominant disorders such as a contemplation choice C1 effective gene is enough for the disorder to be expressed. See you in the next video

Key Concepts

Genetic Inheritance

Population Genetics

Mutation and Phenotypic Expression

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