Multiple Alleles 12. The major blood groups in humans are determined by multiple alleles; that is there are more than two possible alleles, any one of which can occupy a locus. In this ABO blood group system, a single gene can exist in any of three aillelic forms: I^, ", or i. The alleles A and B code for production of antigen A and antigen B (two proteins) on the surface of red blood cells. Alleles A and B are codominant, while allele i is recessive. Four blood groups (phenotypes) are possible from combinations of these alleles (Table 1). TABLE 1 The ABO Blood Groups Blood Type Anitgens Present Antibody Present Genotype Neither A nor B A and B A A B A AB AB Neither A nor B a. Is it possible for a child with blood type O to be produced by two AB parents? - Explain - (yes or no) b. In a case of disputed paternity, the child is type O, the mother type A. Could an individual of the following blood types be the father?. - Ēxplain each possibility. A В AB

Multiple Alleles 12. The major blood groups in humans are determined by multiple alleles; that is there are more than two possible alleles, any one of which can occupy a locus. In this ABO blood group system, a single gene can exist in any of three aillelic forms: I^, ", or i. The alleles A and B code for production of antigen A and antigen B (two proteins) on the surface of red blood cells. Alleles A and B are codominant, while allele i is recessive. Four blood groups (phenotypes) are possible from combinations of these alleles (Table 1). TABLE 1 The ABO Blood Groups Blood Type Anitgens Present Antibody Present Genotype Neither A nor B A and B A A B A AB AB Neither A nor B a. Is it possible for a child with blood type O to be produced by two AB parents? - Explain - (yes or no) b. In a case of disputed paternity, the child is type O, the mother type A. Could an individual of the following blood types be the father?. - Ēxplain each possibility. A В AB

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Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter3: Transmission Of Genes From Generation To Generation

Section: Chapter Questions

Problem 36QP

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dominant-therefore someone with AB genotype has AB phenotype. You can see both because they are codominant) i) What are the possible genotypes for someone with A blood type? ii) What about B blood type? iii) Let's assume that an person by the name of Dustin Beilber (this name sounds really familiar for some reason) is taken to trial in a paternity suit by a woman claiming that he is the father of her child. He claims he is not the father. At the trial, an expert witness reveals the blood types of all three: Dustin's blood type – B Mother's blood type – A Child's blood type – O Based on these data, is it possible that Dustin is the father of this child? (To put this in terms of the scientific method, you are trying to disprove the hypothesis that Dustin is the father). If you can't disprove this, it doesn't mean that he is the father, it simply means that you cannot reject the hypothesis). Explain your answer.
selves in the offspring. The crosses are lled ssed differently in homozy- heterozygous individuals. This produces a con- dition called incomplete dominance. In such cases, both worked out in the same manner as indicated previously, but heterozygous offspring exhibit a phenotype interme- diate between that of the homozygous individuals. Some examples follow. Activity 2 Working Out Crosses Involving Incomplete Dominance 1. The inheritance of flower color in snapdragons illustrates the principle of incomplete dominance. The geno-type RR is expressed as a red flower, Rr yields pink flowers, and rr produces white flowers. Work out the following crosses to determine the expected phenotypes and both genotypic and phenotypic percentages. % of each phenotype: 2. In humans, the inheritance of sickle cell anemia/trait is deter- mined by a single pair of alleles that exhibit incomplete domi- nance. Individuals homozygous for the sickling gene (s) have sickle cell anemia. In double dose (ss), the…
fill the blanks. In humans, having freckles is dominant to not having freckles. What are the possible genotypes with someone with freckles? [blank1], [blank2]
TUSOIES. TITCSC CIITOTIOSOTIES are iavCicu WILT UICTEIevarIC alleles. For example: to Figure 1. Showing a homologous pair of chromosomes that carry two linked genes. Here we can see that one chromosome carries A and B alleles, while the other homologous chromosome carries a and b alleles. This is much more informative than just giving the genotype of AaBb. Another way to symbolize the arrangement of alleles on a chromosome is to give the symbols for alleles on one chromosome above a horizontal line, and the symbols for the alleles on the homologous chromosome below the horizontal line. For example: B b. Figure 2. Showing the arrangement of alleles for a pair of linked genes. Here we can see that, exactly like the example in Figure 1, one chromosome carries A and B alleles, while the other chromosome carries a and b alleles. 1. Suppose that Gene G and Gene D are linked. If the genotype of an organism is GGDD, use both types of symbols you learned in Figure 1 and Figure 2 above to show…
breeding varieties. The first breed is wild type that has black skin with brown patches. The other bree You are studying the genetic basis of ball python skin color. You have two true- has white skin with yellow patches, You would like to know if the skin color difference is due to a step of the crosses, please state your predictions based on your hypothesis. Using a diagram is fine. I X num
True or false? Reasons that are acceptable by many for C-sections include all except triplets.
Multiple Alleles- Blood Types 1. Blood Type is controlled by 3 alleles: What are they? allele is recessive alleles are codominant, and in homozygous condition results in O blood group. 2. and 3. What are the genotypes possible for a person who has: A blood? B blood? O blood? AB blood? 4. A man with type AB blood is married to a woman also with type AB blood. Show the cross. What proportion of their children will have: A blood? B blood? O blood? AB blood? 5. A man has type B blood (genotype I"I") is married to a woman with type O (ii) blood. Show the cross. What proportion of their children will have: 1. A blood? 2. B blood? 3. O blood? 4. AB blood? 6. A woman with type A blood (genotype IAi) is married to a type B person (genotype I®i). Show the cross. What proportion of their children will have: A blood? B blood? O blood? AB blood?
Using the provided image. Using only the pattern in the pedigree what mode of heredity would you predict hemophilia to follow? Provide an explanation for why you choose that mode:
% of each phê 2. In humans, the inheritance of sickle cell anemia/trait is deter- mined by a single pair of alleles that exhibit incomplete domi- nance. Individuals homozygous for the sickling gene (s) have sickle cell anemia. In double dose (ss), the sickling gene causes production of a very abnormal hemoglobin, which crystallizes and becomes sharp and spiky under conditions of oxygen deficit. Heterozygous individuals (Ss) have the sickle cell trait; they make both normal and sickling hemoglobin. Usually these individuals are healthy, but prolonged decreases in blood oxygen levels can lead to a sickle cell crisis. Individuals with the genotype SS form normal hemoglobin. Work out the following crosses: a. Parental genotypes: SS × SS % of each genotype: 41 % of each phenotype: b. Parental genotypes: ss X Ss % of each genotype: % of each phenotype:
Genetics Problems. Show your crosses. It must contain: (a) parental genes, (b) genotypic ratio, (c) phenotypic ratio, (d) hybrid cross and (e) other answer needed in the question. An albino is a person with no pigmentation in his skin, eyes or hair. Normal pigmentation is (A) is dominant over albino (a). A normal pigmented man marries a homozygous normal woman. What would the expected appearances of the children be
Codominance in blood types. If a male with type A blood (with genotype IAi) mates with a female having type B blood (with genotype IBi), what are the phenotypic ratios for the blood types of the offspring? ___ A : ___ B : ___ AB : ____ O Suppose that one parent has type AB blood, and the blood type of the other parent is not known. Describe how a child can (or cannot) have the following blood types: Type A Type B Type AB Type O
Gamete Production: in the following examples please list the possible gametes produced 1) In humans, sickle cell anemia is a disease caused by a mutation of a single gene that codes for an important protein. The allele for the normal protein is dominant (S) to the one that causes sickle cell anemia. a. What gametes would be produced by an individual who suffers from sickle cell anemia produce? b. What gamester would be produce by an individual that is a carrier of the sickle cell trait?