Our Origins: Discovering Physical Anthropology (Fourth Edition)
4th Edition
ISBN: 9780393614008
Author: Clark Spencer Larsen
Publisher: W. W. Norton & Company
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Chapter 3, Problem 4SQ
Summary Introduction
Introduction: A Mendelian trait states that the trait is passed down to offspring will have dominant and recessive alleles of a gene. Alleles have different set of a gene carring genetic information of a particular trait.
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The chart below is showing 4 generations of a family that is affected by a hereditary disease.
a. Is the disorder being tracked dominant or recessive? How do you know?
b. There is only one possible genotype for person C. True or False?
c. What are the possible genotypes for person A?
d. What are the possible genotypes for person B?,
e. If two people with the same genotypes as person C's spouse and person A's
spouse had a child, what is the probability that the child will be affected by this genetic disorder?
(draw a Punnett square using the correct genotypes to help you).
% chance offspring will be affected
% chance offspring will not be affected
Tay–Sachs disease is caused by recessive alleles on anautosome. In which case(s) could two parents with anormal phenotype have a child with Tay–Sachs?a. Both parents are homozygous for a Tay–Sachs allele.b. Both parents are heterozygous for a Tay–Sachsallele.c. One parent is homozygous for a Tay–Sachs allele,and the other is heterozygous.
In a trait that follows Mendelian rules of inheritance, what is the only way an organism can have the recessive phenotype?
A. By having the homozygous recessive genotype
B. By being heterozygous for that genotype
C. It is not possible to get the recessive phenotype in Mendelian genetics
D. If one parent is homozygous recessive for that trait, any offspring are guaranteed the recessive phenotype
E. By being homozygous dominant for that genotype
Chapter 3 Solutions
Our Origins: Discovering Physical Anthropology (Fourth Edition)
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- Which of the following is false? a. the pollen grain shape was studied by Mendel. b. Mendel believed that the characteristics of pea plants were determined by the inheritance units or factors from both parents. c. An allele is one of several possible forms of a gene. d. When the genotype consists of a dominant and recessive allele, the phenotype will be like the dominant allele.arrow_forwardFruit flies are very useful model organisms that have been used to study genetics. One mutant recessive trait in fruit flies is called "eyeless" because it causes flies to have no eyes. Cross an eyeless fly with a homozygous normal fly. a. Draw the Punnett square. b. What is the genotyoe ratio of the offspring? c. What is the phenotype ratio of the offspring? d. What genetic problem is this? (monohybrid, dihybrid or multiple allele)arrow_forwardIf a mouse has a dominant phenotype (P_), how would you determine if it is homozygous (PP) or heterozygous (Pp)? Select one: O a. O b. O c. O d. O e. cross it to a mouse with the dominant trait but a similarly unknown genotype. cross it to a mouse with the recessive trait. cross it to a homozygous dominant mouse. it cannot be determined. cross it to a heterozygous dominant mouse. Oarrow_forward
- A heterozygous individual is crossed with a homozygous recessive individual. a. Draw a Punnett square to represent this cross. b. What is the probability that an offspring will have a homozygous genotype? c. What is the probability that an offspring will have a dominant phenotype? d. What is the probability that three offspring will be produced that all carry the recessive allele but do not express the recessive phenotype?arrow_forwardAlleles that show incomplete dominance will represent: Choose oneAnswer: A . heterozygotes that have a phenotype intermediate between the dominant and recessive alleles. B. homozygotes that have a genotype like the recessive allele C. homozygotes that have a phenotype intermediate between the dominant and recessive alleles. D. heterozygotes that have a genotype like the dominant allelearrow_forwardWhat are the genotypes of the mother and father in the pedigree below? The pedigree shows albinism (an autosomal recessive trait). The shaded shapes represent albino individuals. a. mother - homozygous dominant; father - homozygous dominant b. mother - heterozygous; father - homozygous recessive c. mother - homozygous recessive; father - heterozygous d. mother - heterozygous; father - heterozygous e. mother - homozygous dominant; father - homozygous recessivearrow_forward
- Mendel’s crossing of round-seeded pea plants with wrinkled-seeded pea plants resulted in progeny that all had round seeds. This indicates that the wrinkled-seed trait is Select one: a. rare b. abnormal c. dominant d. codominant e. recessivearrow_forwardWhich of the following is indicated by roman numerals in a pedigree? a.Presence of the studied trait b.Generation c.Sex d.Marriage status Which of the following disorders in humans has an autosomal dominant inheritance pattern? a.Albinism b.Hemophilia c.Tay-Sachs disease d.Huntington’s disease For an X-linked recessive allele, what proportion of female offspring will be carriers in the cross of an affected father and a noncarrying mother? a.50 percent b.0 percent c.100 percentarrow_forwardA test cross is used to determinea. the genotype of an organism with a phenotypically dominant trait.b. the genotype of an organism with a phenotypically recessive trait. c. the genotype of an organism showing pleiotropic effects of a gene.d. if a trait is inherited polygenically.arrow_forward
- Which of the following statements describes Mendel’s Law of Segregation? a. The dominant allele is represented with an uppercase letter and the recessive allele is represented with a lowercase letter. b. A Punnett square can be used to predict the outcome of a parental cross. c. Dominant alleles are always expressed in a homozygous or heterozygous individual. d. A Bb individual will produce B and b alleles, while a bb individual will only produce a b allele.arrow_forwardIn ABO blood group inheritance, what is the relationship between the alleles IA and IB? a. They are pleiotropic to each other. (pleiotropic means one gene also influences two or more unrelated phenotypes) b. They are incompletely dominant to each other. c. They are codominant to each other. d. B alleles are dominant; A alleles are recessive. e. A alleles are dominant; B alleles are recessive.arrow_forwardA woman with a rare autosomal recessive disorder was told that it was unlikely that her children would have the disorderas her husband did not have it. However, her first child has the disorder. a. What is the most likely explanation? b. Diagram the cross between the woman and her husband using a Punnett square, give the genotypic ratio (GR) and phenotypic ratio (PR) from the Punnett square. c. Based on the Punnett square results, what is the chance that her next child will have the disorder?arrow_forward
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Beyond Mendelian Genetics: Complex Patterns of Inheritance; Author: Professor Dave Explains;https://www.youtube.com/watch?v=-EmvmBuK-B8;License: Standard YouTube License, CC-BY