1 a man with type a blood has children with a woman with...

1. A man with type A blood has children with a woman with type B blood. Their child has type O blood. i. What are the genotypes of these 3 individuals? ii. What genotypes and in what frequencies would you expect in future offspring from these two parents? 2. Phenylketouria(PKU) is an inherited disease caused by a recessive allele. If a woman and her husband, who are both carriers, have three children, what is the probability of each of the following? i. All three children are of normal phenotype. ii. All three children have the disease. 3. The genotype of F1 individuals in a tetrahybrid cross is AaBbCcDd. Assuming independent assortment of these four genes, what are the probabilities that F2 offspring will have the following genotypes? i. aabbccdd ii. AaBbCcDd iii. AABBCCDD iv. AaBBccDd v. AaBBCCdd 4. What is the probability that each of the following pairs of parents will produce the indicated offspring?(assume independent assortment of all gene pairs) i. AABBCC X aabbcc ---à AaBbCc ii. AaBbCc X AaBbCc -à AABBCC iii. AABbCc X AaBbCc ---à AAbbCC iv. AaBbCc X AaBbCc ---à AaBbCc v. aaBbCC X AABbcc ---à AaBbCc 5. In maize plants, a dominant allele I inhibits kernel color, while the recessive allele i permits color when homozygous. At a different locus, the dominant allele P causes purple kernel color, while the homozygous recessive genotype pp causes red kernels. If plants heterozygous at both loci are crossed, what will be the phenotypic ratio of the offspring?

Transcript

00:01 Okay, i want to answer this question, let's talk about like alleles and genotypes.

00:05 It says how many different types of gamins are possible from the following genotype, and you have this genotype here that is hydrocygo for the three genes, okay? so in order to get the possible gametes that you can produce here, then you can make a branch diagram.

00:22 Okay, you're going to have here the a gene, and here you're going to have the p and here the c.

00:40 And then you're going to just cross all of them and you're going to have that.

00:45 All of them are going to be different possibilities.

00:47 For example, here you're going to have this gamut.

00:49 Here you're going to have this gamut.

00:52 Here you're going to have this, this, this, and finally, this.

01:04 Okay, so how many gamut you have? how many different gametes you have? you have one, two, three, four, five, six, seven.

01:10 So eight is going to be the answer for this question.

01:12 Question number two says, white color is dominant over yellow coloring squash.

01:17 It says what genotype became phenotypic greatest would you expect from a cross between a heterocygote plant and a yellow plant? so you have that white is dominant over yellow.

01:26 So this is positive that this is white and this is yellow.

01:33 So if you cross a heterocygoyles white fruit, it means this with a yellow plant, it means like this, you are going to have a following panel square that is going to be like this.

01:47 Hitrozygos, heterocygios, heterocygous whitefemoseiocles.

01:50 They are asking you for the genotype and phenotype ratio.

01:53 So the genotype ratio is going to be 2 because you have 2 that are going to be hydrozygos and 2 that are going to be homozygoticego excessive.

02:01 This is the genotype ratio.

02:04 And about the phenotype ratio, it is also going to be 2 because this is going to be 2 whites and this is going to be 2 yellow.

02:11 So 2 and 2.

02:12 And then we have the following the next question that says the so -called blue, gilly gray, and the lusian variety of chick.

02:21 Is produced by a cross between the black and white varieties.

02:25 Only a single pair of alleles is involved.

02:27 What color chickens and what proportion would you expect if you cross two blues? so practically it says that you have two allele here.

02:39 This is the black allele.

02:41 And this b prime is going to be the white allele.

02:47 And when you have homocybin for b, you're going to have a black chicken.

02:51 When you have the homocygoyal for b prime, you're going to have the white variety or chicken.

03:00 And when you have the heterocygous, you're going to get blue.

03:04 Okay, it says what color chickens in what proportion would you expect if you cross two blues? it means if you cross two hetrocygos.

03:14 You're going to get a following.

03:21 You're going to have here homocygoyles for b prime, heterocybozygos, heterocylus, and hemothiocytes for b.

03:28 Okay, and so this is what you're going to have.

03:31 And they're asking you for what color chickens and in what proportion we expect.

03:36 So you're going to get, this is going to be blue.

03:41 Or let me see the aliens here, white.

03:47 White, okay, the homozygoyles for b prime is going to be white.

03:51 So you have white, this is going to be blue, the heterocygoyles, this is going to be also blue, and this is going to be black.

03:58 Okay, so for black.

04:01 First for black.

04:02 You have four possibilities, one, two, three, and four.

04:06 And out of those four possibilities, how many of them are going to be black? you have only one, so one quarter is going to be for black.

04:12 Then you have blue.

04:13 Blue is a heterocyrocygo, so you have here one and two.

04:16 So out of four possibilities, two are going to be hit those cycles, and this is the same as one half.

04:23 And finally, for white, white is homozygos for the b primally.

04:28 So you're going to have also one quarter.

04:30 So this is the answer for these questions.

04:32 Now let's go for the next one that says, from the following blood types determine which baby belongs to which parents.

04:40 So you have the following.

04:41 It says, oh, i'm going to copy this.

04:43 Okay, let me copy this here.

04:47 It says, from the following blood types, it determines which baby belongs to which parent.

04:52 So remember that you have that these homocytes for a and also the heterocycle for a are going to cause for type a blood.

05:00 For the homocycle for b and hydro cycle for b, is going to code for type b blood.

05:06 When you have ab, you're going to have type ab blood.

05:08 And when you have opposite area of exercise, you're going to get type o blood.

05:11 Okay? so it says, you have this that says mrs.

05:18 Doe, mr...

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