BIOLOGY
12th Edition
ISBN: 9781264839698
Author: Raven
Publisher: MCG CUSTOM
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Textbook Question
Chapter 12, Problem 6A
Mendel’s model assumes that each trait is determined by a single factor with alternate forms. We now know that this is too simplistic and that
a. a single gene may affect more than one trait.
b. a single trait may be affected by more than one gene.
c. a single gene always affects only one trait, but traits may be affected by more than one gene.
d. a single gene can affect more than one trait, and traits may be affected by more than one gene.
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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.
In Mendel’s terminology, a “true-breeding” variety of a particular plant:
a. Has a homozygous genotype for that trait
b. All of the listed choices are correct
c. Will have the same phenotype as the parental plant
d. Always has offspring with the same phenotype for that trait
Assume a large population has two alleles, B and b, for a particular trait that displays a normal
pattern of Mendelian inheritance. If 49% of the population displays the recessive phenotype for this
trait..
a. What percent of the population would be heterozygous (Bf)?
b. What percent of the population would be homozygous dominant (BB)?
c. What percent of the population would display the dominant phenotype?
d. What is the frequency of the recessive allele (b) expressed as a percentage?
e. What is the frequency of the dominant allele (B) expressed as a percentage?
Place the number in the space provided without any other symbols.
ME
Chapter 12 Solutions
BIOLOGY
Ch. 12.1 - Prob. 1LOCh. 12.1 - Explain the advantages of Mendels experimental...Ch. 12.2 - Evaluate the outcome of a monohybrid cross.Ch. 12.2 - Explain Mendels Principle of Segregation.Ch. 12.2 - Compare the segregation of alleles with the...Ch. 12.3 - Evaluate the outcome of a dihybrid cross.Ch. 12.3 - Explain Mendels Principle of Independent...Ch. 12.3 - Compare the segregation of alleles for different...Ch. 12.4 - Prob. 1LOCh. 12.4 - Prob. 2LO
Ch. 12.5 - Interpret data from testcrosses to infer unknown...Ch. 12.6 - Describe how assumptions in Mendels model result...Ch. 12.6 - Prob. 2LOCh. 12.6 - Explain the genetic basis for observed alterations...Ch. 12 - Inquiry question What confounding problems could...Ch. 12 - Prob. 2IQCh. 12 - Prob. 1DACh. 12 - Prob. 2DACh. 12 - Prob. 3DACh. 12 - What property distinguished Mendels investigation...Ch. 12 - The F1 generation of the monohybrid cross purple...Ch. 12 - The F1 plants from the previous question are...Ch. 12 - In a cross of Aa Bb cc X Aa Bb Cc, what is the...Ch. 12 - An organisms __________ is/are determined by its...Ch. 12 - Phenotypes like height in humans, which show a...Ch. 12 - Japanese four oclocks that are red and tall are...Ch. 12 - If the two genes in the previous question showed...Ch. 12 - What is the probability of obtaining an individual...Ch. 12 - Prob. 4ACh. 12 - Prob. 5ACh. 12 - Mendels model assumes that each trait is...Ch. 12 - z1. Create a Punnett square for the following...Ch. 12 - Explain how the events of meiosis can explain both...Ch. 12 - Prob. 3SCh. 12 - In mammals, a variety of genes affect coat color....
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- Which if the following is not among Mendels principles? a. There are factors that is transmitted from parent to offspring? b. There are only two kinds of traits, dominant and recessive c. Genes resides in the chromosome d. Pair of single traits segregate randomlyarrow_forwardWhat was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants? Select one: a. There is considerable genetic variation in garden peas. b. Genes are composed of DNA. c. Recessive genes occur more frequently in the F1 generation than do dominant ones. d. Traits are inherited in discrete units (genes), and are not the results of "blending."arrow_forwardIn 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 genotypearrow_forward
- If Mendel chose to study inheritance of height in human, would he have likely discovered the same princeple of heredity that he discovered in working with pea plants? A. Yes, because human height is a continuously varying trait, just like the traits Mendel studied in pea plants. B. No, because the generation time in humans is relatively long compared with pea plants. C. Yes, because the principles of segregation and independent assortment also apply to human genes. D. No, because human height is not genetically determined.arrow_forwardWhich of the following does not cause a modification of Mendelian ratios? a. Sex-linked inheritance b. Multiple alleles C. None d. Maternal inheritancearrow_forwardWhich of the following statements is false?a. Mendelian inheritance patterns obey the law of segregation.b. Mendelian inheritance patterns obey the law of independentassortment.c. All inheritance patterns show a simple dominant/recessiverelationship.d. None of the above is falsearrow_forward
- What is Mendelian inheritance? a. Mendelian genes code an entire phenotype so that children will not be clones of their parents. b. Mendelian genetics are those genes that code for dominant or recessive illnesses but only if no polygenic traits cancel them out. c. Mendelian genes sit at one loci with one allele from Mom and one allele from Dad. d. Mendelian genetics is when two or more genes at two or more loci express one traitarrow_forwardAccording to Mendel, if an individual is heterozygous for a gene, thephenotype will correspond to that ofa. the recessive trait alone.b. the dominant trait alone.c. a blend of the dominant and recessive traits.d. a wild-type traitarrow_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
- The difference between dominant and recessive traits is … Group of answer choices: A.genes for dominant traits are passed on preferentially. B.effects of recessive traits can be hidden by effects of dominant traits. C.recessive traits are deleterious (bad for the organism) and dominant traits are not. D.dominant genes produce proteins, recessive genes do not. E.dominant traits are more likely to be expressed in males.arrow_forwardGregor Mendel noticed that recessive characteristics are "masked" in the F1 generation but reappear in the F2 generation. Which of the following laws best explains this observation? a. The law of products b. The law of segregation c. The law of independent assortment d. The law of linked alleles e. None of the abovearrow_forwardWhich of the following statements correctly describes the Law of Independent Assortment? Select one: a. Sometimes all alleles lack dominance, which leads to a blending of traits. b. The allele a gamete receives for one gene does not influence the allele received for another gene, if the two genes are located on different chromosomes. c. The dominant allele is represented with an uppercase letter and the recessive allele is represented with a lowercase letter. d. A large Punnett square can be used to predict the outcome of a parental cross involving two traits.arrow_forward
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