Human Biology Custom Edition
11th Edition
ISBN: 9781337631532
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Textbook Question
Chapter 20, Problem 9SQ
A person who is a carrier for a genetic trait ___________.
- a. is heterozygous for a dominant trait
- b. is heterozygous for a recessive trait
- c. is homozygous for a recessive trait
- d. could be either a or b but not c
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A disorder that only ever appears in males and is present in all male children is a(n) ________.
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Chapter 20 Solutions
Human Biology Custom Edition
Ch. 20 - Prob. 1RQCh. 20 - What is a carrier of a genetic trait?Ch. 20 - What evidence indicates that a trait is coded by a...Ch. 20 - Prob. 4RQCh. 20 - Explain what nondisjunction is, and give two...Ch. 20 - _______ segregate during ______. a. Homologues;...Ch. 20 - Prob. 2SQCh. 20 - Genes on the same chromosome tend to stay together...Ch. 20 - Prob. 4SQCh. 20 - A chromosomes structure can be altered by _______....
Ch. 20 - Nondisjunction can be caused by ________. a....Ch. 20 - A gamete affected by nondisjunction could have...Ch. 20 - Genetic disorders can be caused by __________. a....Ch. 20 - A person who is a carrier for a genetic trait...Ch. 20 - Prob. 10SQCh. 20 - If a couple has six boys, what is the probability...Ch. 20 - Human sex chromosomes are XX for females and XY...Ch. 20 - People with Down syndrome have an extra copy of...Ch. 20 - Prob. 4CTCh. 20 - Prob. 5CTCh. 20 - About 4 percent of people of Northern European...Ch. 20 - The following pedigree shows the pattern of...
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- Polydactyly is a congenital physical anomaly in in humans, dogs, cats; and having supernumerary fingers or toes. If it is an autosomal dominant trait, when is a genotype of a person that shows normal phenotype? a. heterozygous recessive b. heterozygous dominant c. homozygous recessive d. homozygous dominantarrow_forwardBaldness is a phenomenon where individuals lose hair as they grow older. As an X-linked recessive gene, what instances do females manifest this trait? a. heterozygous recessive b. heterozygous dominant c. homozygous recessive d. homozygous dominantarrow_forwardBrandy has naturally blond hair. Based on this information, what do we know about Brandy’s parents? a. At least one of her parents has a recessive blond hair gene. b. Each of her parents must have one recessive blond hair gene. c. Each of her parents must have one dominant brown hair gene. d. Neither of her parents has a recessive blond hair gene.arrow_forward
- A recessive trait will be observed in individuals that are ________ for that trait. a. heterozygous b. homozygous or heterozygous c. homozygous d. diploidarrow_forwardColorblindness is a recessive x-linked trait. Which genotype represents a male with normal vision? a. XNXN b. XYN c. XnY d. XNYarrow_forwardRace is biological. A. True B.Falsearrow_forward
- Choose the MOST LIKELY inheritance pattern for the trait shown in the pedigree. a. Sex-linked dominant b. Autosomal recessive c. Sex-linked recessive d. Autosomal Dominantarrow_forwardA trait that is present in a male child but not in either of his parents is characteristic of inheritance. a. autosomal dominant b. autosomal recessive c. X-linked recessive d. It is impossible to answer this question without more informationarrow_forwardMany genetic disorders are inherited in a recessive manner Select one: a. False b. Truearrow_forward
- Huntington’s disease is a dominant disorder. Suppose that Kent and Alice are both heterozygous for the disease. What is the probability that their children will have Huntington’s disease? a. None b. 25% c. 50% d. 75% e. 100%arrow_forwardIf two parents with short fingers (dominant) have a child with longfingers, what is the chance their next child will have long fingers?a. There is no chance.b. 1/16c. 1/2d. 3/16e. 1/4arrow_forwardA couple has three children one of the has Cystic Fibrosis (autosomal recessive). If neither parent is affected. What is the probability that their next child will be a sick boy? a. ¼ b. ½ c. 1/8 d. 3/8 e. 1/16arrow_forward
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