Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 17, Problem 7TY
Summary Introduction
Introduction: A gene is defined as the functional unit of a chromosome that codes for a particular protein. Genes are also called hereditory units as these are responsible for transferring genetic information from one generation to other generation. A gene can code for proteins that affect a single function or trait or it can also code for a protein that affect multiple traits.
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Production of more than one phenotypictrait by a single gene is calleda. pleiotropy.b. genetic determinism.c. codominance.d. penetrance.e. genetic recombination.
What can you assert regarding cytoplasmic inherited traits?
A.
extensive phenotypic variation exhibited, even within a single family
B.
reciprocal crosses that give different results
C.
All of the answers are correct.
D.
usually inherited from one parent, typically the maternal parent
E.
present in both males and females
Which of the following statements accurately represents the difference between a gene and a locus?
a. A gene is dominant, and a locus is recessive.
b. A locus and a gene are essentially the same - there is no difference.
c. A locus occurs in diploid cells, and a gene occurs in a haploid cell.
d. A locus is a phenotype and a gene is a genotype.
Chapter 17 Solutions
Biology
Ch. 17.1 - Prob. 1CCCh. 17.1 - Prob. 2CCCh. 17.1 - Prob. 3CCCh. 17.1 - Prob. 4CCCh. 17.1 - Mendels Laws of Inheritance Concept Check: What...Ch. 17.2 - Prob. 1CSCh. 17.2 - Prob. 2CSCh. 17.2 - Prob. 1CCCh. 17.3 - Prob. 1CCCh. 17.3 - Prob. 2CC
Ch. 17.4 - Prob. 1CCCh. 17.4 - Prob. 1EQCh. 17.4 - Prob. 2EQCh. 17.4 - Prob. 3EQCh. 17.5 - Prob. 1CSCh. 17.5 - Prob. 1CCCh. 17.6 - Prob. 1CCCh. 17 - Prob. 1TYCh. 17 - During which phase of nuclear division does the...Ch. 17 - Prob. 3TYCh. 17 - Which of Mendels laws cannot be observed in a...Ch. 17 - During a __________blank, an individual with the...Ch. 17 - Prob. 6TYCh. 17 - Prob. 7TYCh. 17 - A hypothetical flowering plant species produces...Ch. 17 - Genes located on a sex chromosome are said to be...Ch. 17 - Prob. 10TYCh. 17 - Prob. 1CQCh. 17 - A cross is made between individuals having the...Ch. 17 - Core Concept: Systems We can view life as a...Ch. 17 - Discuss the principles of the chromosome theory of...Ch. 17 - When examining a human pedigree, what patterns do...
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- Locus heterogeneity refers to a genetic disorder thata. has a heterogeneous phenotype.b. is caused by mutations in two or more different genes.c. involves a structural change in multiple chromosomes.d. is inherited from both parents.arrow_forwardChoose the statement that is incorrect.a. A son can inherit a recessive allele on anX chromosome from either parent.b. An individual may inherit three or more of eachtype of chromosome characteristic of the species, acondition called polyploidy.c. A female child inherits one X chromosome from hermother and one from her father.d. Pedigree analysis can be used to determine a futurechild’s chance of being born with achondroplasiaarrow_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
- Fragile X is a disorder which causes mental impairment in affected individuals. The trait which is due to a mutation in the FMR1 gene on the X chromosome is inherited in a recessive manner. An unaffected son was born to an affected man and an unaffected woman. The woman’s mother was affected while the father was normal. a. Indicate the gene notation. b. Give the genotype of the son. c. Is it possible for the couple to have an affected daughter? affected son? Derive the genotypic and phenotypic ratios for the offspring. Show and label your solutions properly. d. If the couple has four children, what is the probability that they will have three normal daughters and one normal son?arrow_forwardWhich of the following statements about genes is TRUE? a. Alleles of genes located on the same chromosome may assort independently. b. Alleles of genes on the same chromosome always fail to assort independently. c. Linked genes are located on the same chromosome. d. a and c, but not b e. b and c, but not aarrow_forwardIn 95% of cases of Down's syndrome, there is an entire extra chromosome 21 in every cell. This aneuploid condition is the result of A. Improper crossing over. B. Independent assortment. C. Nondisjunction. D. All are correct.arrow_forward
- A mutation in one gene results in changes in several different, seemingly unrelated, phenotypes. This shows A. Incomplete dominance. B. Aneuploidy. C. Pleiotropy D. A and B. E. B and C.arrow_forwardWhat gametes are produced by the following organisms: a. Genotype YyRr, if Y and R are on different chromosomes b. Genotype YyRr, if dominant Y and R are on the same chromosome, no crossing over c. Genotype YyRr, if dominant Y and recessive r are on the same chromosome, no crossing over d. Genotype YyRr, if dominant Y and R are on the same chromosome, 50% crossing over e. What is the genotype of the F1 generation if parents RRyy and rrYY are crossed, R and y are located on the same chromosome, no crossing over.arrow_forwardCrossing over means the same as: a. incomplete dominance b. the process by which pieces of homologous chromosomes are exchanged c. heterozygosity d. the peculiar lineup of homologous chromosomes e. independent assortmentarrow_forward
- Locus heterogeneity means that a genetic disordera. has a heterogeneous phenotype.b. is caused by mutations in two or more different genes.c. involves a structural change in multiple chromosomes.d. is inherited from both parentsarrow_forwardIn tomatoes, red fruit (R) is dominant over yellow fruit (r). Five generations of red tomato plants were crossed to each other without producing any yellow tomato plants. It can be hypothesized that the red tomato plant must be Select one: a. Homozygous b. Recessive c. Dominant d. Heterozygousarrow_forwardAn organism that has two different alleles for a single trait is said to be for that trait. Select one: O O O a. heterologous b. heterozygous c. homozygous d. haploid e. diploidarrow_forward
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