WORLD OF CELL+MASTERING ACCESS >CUSTOM
9th Edition
ISBN: 9781323445044
Author: Hardin
Publisher: PEARSON C
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Chapter 25, Problem 1Q
Summary Introduction
To determine: The likelihood of a child having polydactyly who has a normal father and a mother with polydactyly.
Introduction: Alteration of the
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To determine whether radiation associated with the atomic bombings of Hiroshima and Nagasaki produced recessive germ-line mutations, scientists examined the sex ratio of the children of the survivors of the blasts. Can you explain why an increase in germ-line mutations might be expected to alter the sex ratio?
Please choose the correct answer. If a recessive mutation kills an individual during the early stages of its development, what is the possible mode of inheritance exhibited if a recessive F1 with heterozygous parents survives?
a. epigenetic inheritance
b. maternal inheritance
c. maternal effect
d. organelle inheritance
You find a person that has a new allele that is not found in DNA samples taken from skin cells of the mother or the father, suggesting that the mutation arose during the formation of the gametes that formed this person. Is it more likely that the mutation was present in the sperm or the egg that formed this person and why do you believe this is the case?”
Chapter 25 Solutions
WORLD OF CELL+MASTERING ACCESS >CUSTOM
Ch. 25 - Cloning can be done by somatic cell nuclear...Ch. 25 - If the DNA content of a diploid cell in the G1...Ch. 25 - Prob. 25.3CCCh. 25 - Prob. 1QCh. 25 - Prob. 25.4CCCh. 25 - What do you think would happen to a pathogenic...Ch. 25 - Prob. 25.6CCCh. 25 - The Truth About Sex. For each of the following...Ch. 25 - Ordering the Phases of Meiosis. Drawings of...Ch. 25 - Telling Them Apart. Briefly describe how you might...
Ch. 25 - Prob. 25.4PSCh. 25 - More about DNA. Let X be the amount of DNA present...Ch. 25 - Meiotic Mistakes. Infants born with Patau syndrome...Ch. 25 - Prob. 25.7PSCh. 25 - QUANTITATIVE Punnett Squares as Genetic Tools. The...Ch. 25 - QUANTITATIVE Genetic Mapping. The following table...Ch. 25 - Prob. 25.10PSCh. 25 - Prob. 25.11PS
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- Brachyolmias are said to be heterogeneous and inherited in both dominant and recessive manners. What might that tell you about how many genes are involved and the types of mutations that affect these genes to cause brachyolmia?arrow_forwardPiebald spotting is a condition found in humans in which there are patches of skin that lack pigmentation. The condition results from the inability of pigment-producing cells to migrate properly during development. Two adults with piebald spotting have one child who has this trait and a second child with normal skin pigmentation. a. Is the piebald spotting trait dominant or recessive? What information led you to this answer?arrow_forwardThis is a modified question from the textbook, Campbell Biology in Focus (3rd edition), question #5 on page 256. A man with normal vision marries a woman with normal vision whose father was red-green color-blind (a recessive, sex-linked condition). Assuming that the woman's mother had normal vision and did not carry the recessive gene, what is the probability that the married couple will have a color-blind daughter? That their first son will be color-blind? That their second son will be color-blind? Include Punnett square for each question in your answer. You may find the below diagram helpful (the orange square means the individual has the phenotype of color-blindness, while the beige means the individual is a carrier of the mutated color-blind gene where XN and Xn represent dominant and recessive allele, respectively).arrow_forward
- In humans, there is a gene called sickle-cell anemia, which produces severe anemia when homozygous recessive. The name of the disease comes from the fact that many red blood cells take on abnormal sickle shape. People homozygous recessive for this trait usually die before adulthood. Heterozygous people appear normal, but when a sample of the blood is held under low oxygen concentration, the red cells take on the sickle shape. A young woman about to be married is concerned about her future children because her brother died of sickle-cell anemia. A sample of her blood sickles under low oxygen concentration, but that red blood of her perspective husband remains normal. What can you say about the woman and the man, and about their future children? HINT: Use Punnett square to help you and receive full creditarrow_forwardIn humans, there is a gene called sickle-cell anemia, which produces severe anemia when homozygous recessive. The name of the disease comes from the fact that many red blood cells take on abnormal sickle shape. People homozygous recessive for this trait usually die before adulthood. Heterozygous people appear normal, but when a sample of the blood is held under low oxygen concentration, the red cells take on the sickle shape. A young woman about to be married is concerned about her future children because her brother died of sickle-cell anemia. A sample of her blood sickles under low oxygen concentration, but that red blood of her perspective husband remains normal. What can you say about the woman and the man, and about their future children?arrow_forwardPiebald spotting is a condition found in humans inwhich there are patches of skin that lack pigmentation. The condition results from the inability ofpigment-producing cells to migrate properly duringdevelopment. Two adults with piebald spotting haveone child who has this trait and a second child withnormal skin pigmentation.a. Is the piebald spotting trait dominant or recessive?What information led you to this answer?b. What are the genotypes of the parents?arrow_forward
- If our DNA contains all the information about who we are, how can something that does not involve changing the gene sequence cause changes in phenotypes? Describe briefly how these changes happen.arrow_forwardThe trait of having short eyelashes is recessive in humans. A male with short eyelashes has two children with a female. One child has short eyelashes and the other has the long eyelash phenotype. What are the genotypes of the two parents?arrow_forwardA zoologist is studying a deer and found out that a gene is located on autosome two. This gene controls antler production in the male deer. Take note that female deer do not produce antlers. Which mode of inheritance is shown by these animals? Explain your answer in not more than 20 words.arrow_forward
- Consider a couple: a woman who is homozygous for a recessive mutation that causes X-linked colorblindness, and a man with full color vision (he does not carry a copy of the mutation). a) What is the probability that a son of this couple will be colorblind? b) What is the probability that a daughter of the couple will be colorblind?arrow_forwardIn humans, the gene for albinism (a) is recessive to the gene for normal skin pigmentation (A). If two heterozygous persons have children, what is the probability they will have a child who is an albino? What is the probability they will have a child that is a carrier of the recessive gene?arrow_forwardWhy are monozygotic twins genetically identical, whereas dizygotic twins share only 50% of their genes on average?a. Monozygotic twins tend to look more similar.b. Monozygotic twins develop from two different eggs fertilized by the same sperm, whereas dizygotic twins develop from two eggs fertilized by two different sperm.c. Monozygotic twins develop from a single egg fertilized by one sperm, whereas dizygotic twins develop from a single egg fertilized by two different sperm.d. Monozygotic twins develop from a single egg fertilized by a single sperm, whereas dizygotic twins develop from two eggs fertilized by two different sperm.arrow_forward
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