Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 17, Problem 4TY
Which of Mendel’s laws cannot be observed in a single-factor cross?
- a. segregation
- b. dominance/recessiveness
- c. independent assortment
- d. codominance
- e. All of the above can be observed in a single-factor cross.
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Gregor 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.
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e.
None of the above
Gregor Mendel proposed the law of independent assortment based on the observation that dihybrid crosses of heterozygous individuals produced progeny in a 9:3:3:1 ratio. For this observation to hold, which assumption must be true?
A. The traits are governed by genes on different chromosomes.
B. The traits are governed by genes on the same chromosome.
C. The traits are governed by genes with only two alleles.
D. The traits are governed by genes with only three alleles.
Which of the following is evidence that Mendel had that helped him to construct his Law of Segregation?A) His F2 generation in the dihybrid cross resulted in a 1:1:1:1 distribution of phenotypes.B) He found no linkage of different genes in the offspring of his pea plants.C) The F1 generation of the monohybrid cross resulted in blended phenotypes.D) The F2 generation of the monohybrid cross resulted in the recessive trait reappearing as a phhenotype.E) Two of the above are correct.
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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- In the P cross between a homozygous, round pea parent and a homozygous, wrinkled pea parent, which of the following did Mendel either observe or subsequently conclude?A) All somewhat wrinkled peas in the F1 showed blending inheritance.B) All round F1 peas led Mendel to conclude independent assortment.C) The F1 generation consisted of all peas being round and yellow.D) Two of the above are correct.E) None of the above is correct.arrow_forwardIn the P cross between a homozygous, round pea parent and a homozygous, wrinkled pea parent, which of the following did Mendel either observe or subsequently conclude? A) All somewhat wrinkled peas in the F1 showed blending inheritance. B) All round F1 peas led Mendel to conclude independent assortment. C) The F1 generation consisted of all peas being round and yellow. D) Two of the above are correct. E) None of the above is correct.arrow_forwardIn Mendel’s law, pairs of characters separate during gamete formation is called? A. Incomplete dominant B. Law of segregation C, Law of independent assortment D. Law of dihybridarrow_forward
- A) You cross a plant with genotype AaBbDd to a plant with genotype aaBbDd. What is the probability of an offspring with genotype AaBBD_ or genotype aaB_Dd? Show your work. B)Explain how Mendel’s Law of Segregation affected the way you solved partA.arrow_forwardWhat does a bell-shaped curve of a graph indicate? A. Mendelian inheritance pattern B. Incomplete dominance C. Codominance D. Continuous variationarrow_forwardn each case where Mendel crossed (i.e., mated) two different true-breeding plants as parents, the offspring displayed only one of the two traits seen in the parents. For instance, a cross between a true-breeding “tall” plant and a true-breeding “short” plant produced offspring that were all “tall.” This observation supports which principle of genetics? a. The law of segregation b. The law of independent assortment c. Dominance and recessiveness d. Allele anomaly e. Gene linkagearrow_forward
- 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_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_forwardWhat is the reason for doing a test cross? a. to identify heterozygous individuals with the dominant phenotype b. to determine which allele is dominant and which is recessive c. to identify homozygous recessive individuals in the F2 d. to determine if two genes assort independentlyarrow_forward
- Imagine that you are performing a cross involving seed color in garden pea plants. What traits would you expect to observe in the F1 offspring if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green. a. only yellow-green seeds b. only yellow seeds c. 1:1 yellow seeds:green seeds d. 1:3 green seeds:yellow seedsarrow_forwardThe phenotype of individuals heterozygous for ________ alleles comprises both homozygous phenotypes. a. epistatic c. pleiotropic b. codominant d. hybridarrow_forwardThe text outlines some of the problems Frederick William I encountered in his attempt to breed tall Potsdam Guards. a. Why were the results he obtained so different from those obtained by Mendel with short and tall pea plants? b. Why were most of the children shorter than their tall parents?arrow_forward
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