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Ch. 14 - Mendel and the Gene
All textbooksFreeman 8th EditionCh. 14 - Mendel and the GeneProblem 12a
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Chapter 14, Problem 12a

Suppose you are heterozygous for two genes that are located on different chromosomes. You carry alleles A and a for one gene and alleles B and b for the other. Draw a diagram illustrating what happens to these genes and alleles when meiosis occurs in your reproductive tissues.

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Hello everyone and welcome to today's video. So in today's video we need to analyze the following figure which shows the gametes produced by an organism for two genes need to depict the status of these genes and I want you to just realize something very important when we're depicting the status of these genes. We're talking about the organism. So we're only going to be focusing on this area of the graph. We're not going to be looking at the gametes because we're talking about the jeans here at the beginning as we see them. So now that we know that let's look at how many A leo's each gene has in terms of the organism. So now Gene one has to leo's this name, A leo A and B. O. B. If we look at the organism, A leo A. Is present here and Olio B. Is also present. So the organism has both a leo's and it's an organism that is A. B. So it's genotype is going to be a B. Because of this. It is going to be heterosexual for Gene One. And then we have gene too. And something very similar happens. Let's say that this is a little C. And L. E. O. D. A. Leo C. Is present here. And Olio di is also present here. The organism is going to have a genotype that is C. V. And is also going to be heterocyclic. So looking at these, both Gene one and two are going to be heterosexuals and this is reflected by answer choice C. So we're going to highlight it as a final answer to our question. I really hope this video helped you, and I hope to see you on the next one.
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Imagine repeating the experiment on epigenetic inheritance that is shown in Figure 19.6. You measure the amount of radioactive uridine (U) incorporated into Hnf4a mRNA in counts per minute (cpm) to determine the level of Hnf4a gene transcription in rats born to mothers fed either a normal diet or a low-protein diet. The results are 11,478 cpm for the normal diet and 7368 cpm for the low-protein diet. For this problem, your task is to prepare a graph similar to the one at the bottom of Figure 19.6 that shows the normalized results for the low-protein diet relative to the normal diet. Normalizing values means that the value obtained from one condition is expressed as 1.0 (the norm; the normal diet in this case) and the values obtained from any other conditions (low-protein diet in this case) are expressed as decimal values relative to the norm.

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The smooth feathers on the back of the neck in pigeons can be reversed by a mutation to produce a 'crested' appearance in which feathers form a distinctive spike at the back of the head. A pigeon breeder examined offspring produced by a single pair of non-crested birds and recorded the following: 22 non-crested and 7 crested. She then made a series of crosses using offspring from the first cross. When she crossed two of the crested birds, all 20 of the offspring were crested. When she crossed a non-crested bird with a crested bird, 7 offspring were non-crested and 6 were crested. For these three crosses, provide genotypes for parents and offspring that are consistent with these results.

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Textbook Question

The smooth feathers on the back of the neck in pigeons can be reversed by a mutation to produce a 'crested' appearance in which feathers form a distinctive spike at the back of the head. A pigeon breeder examined offspring produced by a single pair of non-crested birds and recorded the following: 22 non-crested and 7 crested. She then made a series of crosses using offspring from the first cross. When she crossed two of the crested birds, all 20 of the offspring were crested. When she crossed a non-crested bird with a crested bird, 7 offspring were non-crested and 6 were crested. Which allele is dominant?

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Textbook Question

Suppose you are heterozygous for two genes that are located on different chromosomes. You carry alleles A and a for one gene and alleles B and b for the other. Label the stages of meiosis, the homologous chromosomes, sister chromatids, nonhomologous chromosomes, genes, and alleles.


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Suppose you are heterozygous for two genes that are located on different chromosomes. You carry alleles A and a for one gene and alleles B and b for the other. Be sure to list all the genetically different gametes that could form and indicate how frequently each type should be observed.

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Suppose you are heterozygous for two genes that are located on different chromosomes. You carry alleles A and a for one gene and alleles B and b for the other. On the diagram, identify the events responsible for the principle of segregation and the principle of independent assortment.

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