In an 1889 book titled Natural Inheritance (Macmillan, N...

Question

In an 1889 book titled Natural Inheritance (Macmillan, New York), Francis Galton, who investigated the inheritance of measurable (quantitative) traits, formulated a law of 'ancestral inheritance.' The law stated that individuals inherit approximately one-half of their genetic traits from each parent, about one-quarter of the traits from each grandparent, one-eighth from each great grandparent, and so on. In light of the chromosome theory of heredity, argue either in favor of Galton's law or against it.

Accepted Answer

Hi, everyone. Welcome back. Let's look at the next question. It says which of the following supports the chromosome theory of heredity? Let's look through our answer choices. Noting that choice D is all options are correct. So we do have the chance that there's more than one correct answer here. Choice A says chromosomes come in homologous paris. Well, this would be correct because the fact they come in those homologous pairs, one from each parent supports the observation that offspring inherit one trait from each parent and that traits assort independently. So I've marked this as correct, but I won't select this as a correct answer since we do have that all options are correct. Choice here. Answer B says, or choice B says during mitosis, homologous pairs separate forming deployed cells. Well, this is not correct because when homologous pair separate during mitosis, they form hap Lloyd cells as a result that will then combine in fertilization. So choice B is not correct. Therefore, we can also eliminate choice D, all options are correct. Since we've found an incorrect answer, then finally, choice C says the different chromosome pairs are sorted into gametes independently. During my topic cell division. Well, this is not correct. The chromosome pairs do sort into gametes independently as we discussed. But that's during my ah tick cell division, not my topic, cell division. My topic cell division is just that duplication where the daughter cells are identical to the parent cells. So they have the same number of chromosomes are just an identical copy. Chromosome pairs are sorted into gametes independently during mitosis. So choice C is not correct. So we can go ahead and select choice A as our answer, we've eliminated all the others. So which of the following supports the chromosome theory of heredity. And that is choice A that chromosomes come in homologous pairs. See you in the next video.

Key Concepts

Chromosome Theory of Heredity

Quantitative Traits

Ancestral Inheritance

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