In humans, an allele for black hair in one gene can mask the expression of color on a second gene. In one family with 10 children, 7 have black hair like their parents, 2 with red hair, and one with blond hair. The blond child soon came of age and married a man with red hair. All their children have red hair. a. What specific mode of inheritance is exhibited? b. Using the letters A and B, assign alleles to the traits c. Based on the 9:3:3:1 ratio, what are the genotypes of the following:  7 children with black hair ________________  2 children with red hair ___________________  1 child with blond hair ____________________ d. Give the COMPLETE genotypes of the following:  Parents of the children ____________________  Man with red hair _________________________  All children (of the man) with red hair ________________

In humans, an allele for black hair in one gene can mask the expression of color on a second gene. In one family with 10 children, 7 have black hair like their parents, 2 with red hair, and one with blond hair. The blond child soon came of age and married a man with red hair. All their children have red hair. a. What specific mode of inheritance is exhibited? b. Using the letters A and B, assign alleles to the traits c. Based on the 9:3:3:1 ratio, what are the genotypes of the following:  7 children with black hair ______  2 children with red hair _  1 child with blond hair d. Give the COMPLETE genotypes of the following:  Parents of the children  Man with red hair _  All children (of the man) with red hair ____

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter21: Microevolution: Genetic Changes Within Populations

Section: Chapter Questions

Problem 12TYK: Discuss Concepts Many human diseases are caused by recessive alleles that are not expressed in...

See similar textbooks

Similar questions

SUBJECT: GENETICS Topic: Probability 1. Consider albinism a trait to occur in a human family. If two parents areheterozygous for such trait, the probability of having a normally pigmented child is 3//4 and having an albino child is ¼. What is the probability that 2 will be normal and 1 will be albino?
1A. Fruit Flies and Genetics Research: Imagine you are working in a genetics lab with the fruit fly Drosophila melanogaster, a model organism for genetics research. You want to determine whether a trait you have discovered in fruit flies is dominant or recessive.• Explain how you would design an experiment to answer this question.• Predict what types of outcomes are possible. Which would indicate that the trait is dominant? Which would indicate that it is recessive? 1.B Model Genetic Organisms: Why are fruit flies considered a model genetic organism? Would humans fit this description?
Question:- Based on your selected mode of inheritance, show the genotypes for the following individuals. [Use these symbols for alleles: if it is autosomal, then use the symbols B - dominant, b - recessive (e.g. BB, bb etc.) if it is X-Linked, then X(B) - dominant, X(b) - recessive, and Y for Y-chromosome (e.g. X(B)X(B), X(B)Y etc.) ] I-1 I-2 II-7 II-8 III-10 III-11 III-12 IV-8 IV-9
211 Inheritance 2. The pedigree chart below illustrates the inheritance of a trait (darker symbols) in two families joined in marriage. 2 4 6 8. 10 11 12 13 14 II 4 5 (a) State whether the trait is dominant or recessive, providing a reason for your choice: (b) State whether the trait is sex-linked or not, providing a reason for your choice: 3. The recessive sex-linked gene (h) prolongs the blood-clotting time, resulting in the genetically inherited disease called hemophilia. From the information in the pedigree chart (right), answer the following questions: Hemophilia in humans (a) If 112 marries a normal man, what is the probability of her first child being a hemophiliac? 1 (b) Suppose her first child is actually a hemophiliac. What is the chance that her second child will be a boy with hemophilia? 4 (c) If 114 has children with a hemophiliac man, what is the probability that her first child will be phenotypically normal? (d) If the mother of 12 was phenotypically normal, what…
Question:- For a simple cross between a purple-flowered plant and a white-flowered plant, where purple is dominant over white. a. Show the F2 in a Punnett square. What are the proportions of genotypes and phenotypes? Express as fractions, decimal fractions and ratios. b. Now imagine that half of the pollen carrying the recessive allele die before reaching their target, while those carrying the dominant allele are unaffected; what are the proportions of genotypes and phenotypes now?What does this tell you about Mendel’s principle of segregation?
1. Fruit Flies and Genetics Research: Imagine you are working in a genetics lab with the fruit fly Drosophila melanogaster, a model organism for genetics research. You want to determine whether a trait you have discovered in fruit flies is dominant or recessive.• Explain how you would design an experiment to answer this question.• Predict what types of outcomes are possible. Which would indicate that the trait is dominant? Which would indicate that it is recessive?2. Model Genetic Organisms: Why are fruit flies considered a model genetic organism? Would humans fit this description?
You are a studying the genetic basis of horn color in unicorns. Gene C determines the color of pigment destined for the horn by converting a pink precursor into a purple pigment. C- individuals make purple pigment whereas cc individuals accumulate pink precursor. Gene D ensures the deposition of the pigment into the horn cells, such that D- individuals have a colored horn (purple or pink), whereas dd individuals have a white horn. You breed two purple horned unicorns to each other (CcDd). Assuming Gene C and Gene D are unlinked, what is the probability that the baby unicorn has a purple horn? Please express your answer to 2 decimal places (e.g. 0.69).
1. In humans, widow’s peak (W) is dominant over having a straight hairline (w). If a homozygous man with a widow’s peak has a child with a woman with a straight hairline, what are the odds the child will have a widow’s peak? Show work. 2. Ellis-van Creveld syndrome is a recessive inherited condition that results in 6-fingered dwarfism. Two parents without this condition have with Ellis-van Creveld syndrome. What are the genotypes of the parents and offspring? What are the odds that the son will have a 6-fingered child if his partner is a woman who is heterozygous for the condition? Show work. 3. The gene for dangling earlobes is dominant over the gene for attached earlobes. A woman with attached earlobes has a child with a man with dangling earlobes whose mother had attached earlobes. What is the probability that this child will have attached lobes? Show work. 4. In humans, normal pigmentation is due to a dominant gene, while albinism is recessive. A normally pigmented man has a…
Recessive epistasis: In a cross between fruit flies that are both double heterozygous for modifier gene and coat color, in the total offspring of 192, how many fruit flies have gray- coat, white coat, and black coat? A recessive allele blocks the expression of the coat color of fruit flies. Make a null hypothesis, compute for chi-square and determine if the null hypothesis is accepted or rejected.Show your answer, table, punnet square, and solution.
Discuss inheritance. Think broadly on inheritance patterns through generations. What impact do modifications, such as those offered by CRISPR and genetic testing, have on the generational lineage of these traits? Are some traits (e.g., susceptibility to Sickle Cell Anemia) worth removing from our genome? List plus and minuses for gene removal (include facts and references). Support your position.
PEDIGREE ANALYSIS ANSWER THE FOLLOWING QUESTIONS 1. The pedigree below shows a family's pedigree for colorblindness. Which sex can be carriers of colorblindness and not have it? 2. With this in mind, what kind of trait is colorblindness? 3. Why dies individual IV-7 have colorblindness? 4. Why do all the daughters in generation II carry the colorblind gene? 5. Name two (2) IV generation colorblind males.
Discuss inheritance. Think broadly on inheritance patterns through generations. Consider Mendelian traits versus polygenic traits. What impact do modifications, such as those offered by CRISPR and genetic testing, have on the generational lineage of these traits?Are some traits (e.g., susceptibility to Sickle Cell Anemia) worth removing from our genome? Support your position.