BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 14, Problem 5SA
Summary Introduction
Introduction:
The dominant allele masks the expression of the recessive allele. Therefore the dominant allele is expressed in homozygous and heterozygous genotype while the recessive
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What is the probability of a child having a recessive disorder if both parents are heterozygous carriers?
A. 1/2
B. 1/4
C. 3/4
D. 2/3
E. Zero
Two parents without cystic fibrosis have a child with cystic fibrosis. The allele for cystic fibrosis is therefore _________ to the non-disease allele
Group of answer choices
A. codominant
B. recessive
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E. incompletely dominant
Choose the MOST LIKELY inheritance pattern for the trait shown in the pedigree.
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d. Autosomal Dominant
Chapter 14 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 14 - Constructing a family pedigree is particularly...Ch. 14 - Prob. 2SACh. 14 - Prob. 3SACh. 14 - Prob. 4SACh. 14 - Prob. 5SACh. 14 - A trait that is present in a male child but not in...Ch. 14 - Color blindness is a case of ________ inheritance....Ch. 14 - Prob. 8SACh. 14 - Alleles for Tay-Sachs disease are inherited in an...Ch. 14 - Prob. 10SA
Ch. 14 - Prob. 11SACh. 14 - Prob. 12SACh. 14 - Prob. 13SACh. 14 - Klinefelter syndrome XXY can be easily diagnosed...Ch. 14 - Match the chromosome terms appropriately. ___...Ch. 14 - Does the phenotype indicated by the red circles...Ch. 14 - Human females have two X chromosomes XX; males...Ch. 14 - Somatic cells of individuals with Down syndrome...Ch. 14 - An allele responsible for Marfan syndrome Section...Ch. 14 - Both Duchenne muscular dystrophy and color...
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- A 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_forwardPolydactyly 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_forwardThe flower color gene studied by Mendel affected three traits. This is an example of ________. a. pleiotropic genes b. codominant inheritance c. polygenic inheritancearrow_forward
- Assume that attached earlobes is an autosomal recessive trait with 47% penetrance. If one parent is heterozygous (Aa) and the other homozygous recessive (aa) for the attached earlobe gene, what is the probability that their first child will have attached earlobes? Show calculations please! a. 50%b. 11.75%c. 25%d. 23.5%e. 74%arrow_forwardWhich of the following does not describe the pedigree analysis ofan autosomal dominant disorder?a. heterozygotes are affectedb. two affected parents will always have affected childrenc. affected children usually have an affected parentd. two unaffected parents will not have affected childrenarrow_forwardBlue eyes and a straight hairline are both recessive alleles for two different genes. The dominant phenotypes of the two different genes are brown eyes and a widow’s peak. a male with blue eyes and a widow’s peak, and a female with brown eyes and a straight hairline, have a child What is the probability will have blue eyes and a straight hairline? A. 1/2 B. 1/4 C. 1/8 D. 1/16arrow_forward
- Assume that attached earlobes is an autosomal recessive trait with 47% penetrance. If one parent is heterozygous (Aa) and the other homozygous recessive (aa) for the attached earlobe gene, what is the probability that their first child will have attached earlobes? Show your calculation, with labels. a. 50%b. 11.75% c. 25%d. 23.5% e. 75%arrow_forwardColor blindness is an x-linked recessive disorder. A woman who is a carrier for color blindness has children with a man who is color blind. Determine the probability that their child will be color blind. a. 0 % b. 25% c. 50% d. 100%arrow_forwardAutosomal nondisjunction can result in Select one: A. Down syndrome. B. Turner syndrome. C. Klinefelter syndrome. D. XYY males.arrow_forward
- Tay-Sach's disease is caused by one gene. The disease is recessive. If two people were both carriers for this disease, what is the probability that their child would have the disease? A. 25% B. 50% C. 75% D. 0% E. 100%arrow_forwardA Father and Mother are both carriers of the autosomal recessive condition known as albinism. They have one child, and a second child two years later. Their first child was not albino. Knowing this, you can say that the probability of the second child having albinism is Note Albinism is the result of a lack of pigmentation in skin and other cells. O a. 100% b. dependent on the the genotype of the first child O C. 50% O d. 25%arrow_forwardFreckles are considered to be a dominant trait. If a mother without freckles and a father without freckles have a child, what are the odds that the child will have freckles? a. 1 in 4 chance (25%) b. 2 in 4 chance (50%) c. 3 in 4 chance (75%) d. It is impossible for the child to develop freckles (0% chance).arrow_forward
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