Example-of-sex-linked-inheritance

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Question:15. Two parents have the genotype Gg for a genetic disorder caused by a dominant allele. What is the chance that any of their children will inherit the disorder? (Hint: complete a Punnett square cross on a separate piece of paper.) A. 25% B. 50% C. 75% D. 100% 16. Human height occurs in a continuous range because it is affected by the interaction of several genes, making it a(n) A. autosomal trait. B. sex-linked trait. C. polygenic trait. D. codominant trait. 17. The gene linkage map shown in Figure 7.2 shows the order of genes A, B, and C. Which of the following statements about the genes is true? A. The distance between A and B is 14.5 map units. B. A and B cross over 2.5% of the time. C. A and C are linked 8.5% of the time. D. B and C are most likely to be inherited together. 18. Two genes cross over 6% of the time. This percentage means that the genes are A. inactivated in 6 out of 100 offspring. B. incompletely dominant in 6 out of 100 offspring. C. not inherited together in 6 out of 100 offspring. D. on sex chromosomes in 6 out of 100 offspring. 19. Suppose a person is a carrier for a genetic disorder. Which of the following phrases about this person is true? A. Does not have the disorder but can pass it on B. Will develop the disorder only late in life C. Cannot pass the disorder to sons, just daughters D. The allele is not passed on due to Y chromosome inactivation

Answers:Ok here we you go: 15. C 75% 16. C polygenic trait 17. I need Figure 7.2 to do this, but the answer will either be A or D 18. C not inherited together in 6 out of 100 offspring 19. A Does not have the disorder but can pass it on Hope that this helps

Question:1. What is a mutation? a. any change that is harmful to an organism b. any change in a gene or chromosome c. any change that is helpful to an organism d. any change in the phenotype of a cell 2. A mutation is harmful to an organism if it __________ a. changes the DNA of the organism. b. changes the phenotype of the organism. c. reduces the organism s chances for survival and reproduction. d. makes the organism better able to avoid predators. 3. How does a geneticist use pedigrees? a. to create genetic crosses b. to replicate identical strings of DNA c. to prove that sex-linked traits are caused by codominant alleles d. to trace the inheritance of traits in humans 4. What is a pedigree? a. a chart that tracks which members of a family have a particular trait b. a geneticist who studies the inheritance of traits in humans c. a picture of all of the chromosomes in a cell d. an allele passed from parent to child on a sex chromosome 1st person to answer them all right gets 10 point

Answers:1-b In biology, mutations are changes to the nucleotide sequence of the genetic material of an organism 2-c deleterious (bad) mutations are reduced in frequency in the gene pool by natural selection, 3-d A pedigree chart is a chart that tells one all of the known phenotypes for an organism and its ancestors 4-a see above

Question:If someone could answer these quesions, that'd be great. 2) Apply the law of segregation to explain the kind of gametes produced by an animal that has the genotype Aa. 3) One parent is homozygous for a certain trait and the other is heterozygous. What fraction of their offspring would you expect to be heterozygous? 1) What are the chances of tossing 4 pennies in the air and having them all come up tails? 2) What genotypic ratio could you expect from a cross between an organism having the genotype Dd and an organism with the genotype DD? 3) Watermelons with a round shape are crossed with those having a flatter shape. Some offspring have an oval shape. Explain. 1) Colors of wheat kernels range from white to dark red, with various shades of pink in between. By what pattern of inheritance is this trait controlled? Sketch a graph that would represent this distribution of colors. _ more questions_ 2) In fruit flies the gene for red eyes R is dominant of the gene for white eyes r and is sex linked. If an offspring is a white eyed female, and her female parent has red eyes, what must the genotype of her male parent be? 3) Explain how the environment can affect the expression of various traits in an organism.

Answers:2. The law of segregation says that the factors that control a trait separate from each other and go into different gametes. In your example, the factors for the trait are Aa. When gametes are made, the A goes into half of the gametes and the a goes into the other half of the gametes. 3. One parent is homozygous (BB) and the other is heterozygous (Bb). Cross these on a Punnett square BB x Bb. The results are BB, BB, Bb, Bb. How many of these are heterozygous? You know that heterozygous means that the two letters don't match. Two out of the four possibilities of offspring are Bb where the letters don't match. 1/2 are heterozygous. 1. In probability the word "and" means to multiply. You toss four pennies. The first one comes up tails (1/2 chance of that), AND the second one comes up tails (1/2 chance of that), AND the third one comes up tails (1/2 chance of that), AND the fourth one comes up tails (1/2 chance of that). ... tails AND tails AND tails And tails = 1/2 * 1/2 * 1/2 * 1/2 = 1/16 chance of having all four tails. 2. A genotypic ratio is just the ratio of the possible combinations of genes in the offspring. Start with the parents Dd x DD. Put the cross on the Punnett Square. The four answer boxes on the square will be DD, dD, DD, dD. What is the ratio of genotypes? 2 DD: 2 dD EXCEPT, you always reduce a ratio just like you always reduce a fraction. Divide both sides by 2. The answer is 1 DD: 1 dD. 3. Round x flat = oval? Crossing two shapes gives a shape that is intermediate ... something that is in between the shapes of the parents. This is incomplete dominance. (memory trick: *in*termediate, *in* between, *in*complete dominance). RR = round FF = flat RF = oval P = round x flat = RR x FF F1 = oval = RF 1. Any time you have a whole range of phenotypes or forms, that's caused by polygenic inheritance ... a trait that is governed by two or more different pairs of genes. The graph should look like a bell curve - low on each end and higher in the middle. 2. In fruit flies the gene for red eyes R is dominant of the gene for white eyes r and is sex linked. If an offspring is a white eyed female (She has to be Xr Xr), and her female parent has red eyes (Mom must be XR Xr), what must the genotype of her male parent be (Dad must be Xr Y because he gave Xr to the daughter fly and he is male)? 3. The genes may say that the plant is a certain shade of dark green and is a certain height. The color can be affected by the environment: not enough light, too close to a building, in poor soil, had a box put over it, etc. The height might not be what the genes said: too little water, poor soil, not enough light, strong winds, etc.


From Youtube

Recessive Single Gene Disorders | Genetics | Biology

To purchase this program please visit www.greatpacificmedia.com Segment from the program The Human Genome: Traits, Disorders, and Treatments. DVD Description Our Human Genome DVD begins by looking at single gene genetic disorders including recessive disorders such as Tay-Sachs and sickle-cell anemia, dominant disorders such as Huntington's disease, and sex-linked disorders such as hemophilia and color blindness. The program then looks at polygenic inheritance and environmental influences on the expression of genes. Chromosomal inheritance of disorders such as Down syndrome are then explored before looking at the ethical issues involved in genetic testing and the hope promised by the Human Genome Project.

Mendel Single Trait Experiments | Genetics | Biology

To purchase this program please visit www.greatpacificmedia.com Segment from the program Understanding Inheritance: Mendel, Method, and Mapping. DVD Description Our Mendel DVD delves into the fundamental aspects of genetic inheritance and how Mendel discovered the principles that form the foundation of modern genetics. The program first goes to Mendel's pea garden to investigate how Mendel came to propose the Laws of Dominance, Independent Assortment and Segregation and how those laws have been modified as a result of work done by those that followed Mendel. The program later explores sex-linked traits, the use of Punnet squares, incomplete dominance, codominance, and polygenic inheritance.

Polygenetic Inheritance | Genetics | Biology

To purchase this program please visit www.greatpacificmedia.com Segment from the program The Human Genome: Traits, Disorders, and Treatments. DVD Description Our Human Genome DVD begins by looking at single gene genetic disorders including recessive disorders such as Tay-Sachs and sickle-cell anemia, dominant disorders such as Huntington's disease, and sex-linked disorders such as hemophilia and color blindness. The program then looks at polygenic inheritance and environmental influences on the expression of genes. Chromosomal inheritance of disorders such as Down syndrome are then explored before looking at the ethical issues involved in genetic testing and the hope promised by the Human Genome Project.


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