Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 12, Problem 22CTQ
Describe one of the reasons why the garden pea was an excellent choice of model system for studying inheritance.
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Mention the advantages of selecting pea plant for experiment by Mendel.
With the help of suitable diagram, represent the operation of naturalselection on different traits.
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The F1 population produced flowers in a 3:1 ration of dominant to recessive traits.
The F2 population produced flowers in a 3:1 ration of dominant to recessive traits.
Mendel cross-bred F1 plants with F2 plants.
Mendel labeled the offspring of the first plants bred F1, for the first filial generation
Mendel crossed two identical, true-breeding plants for a particular characteristic.
Mendel cross-bred F1 plants with each other.
Mendel crossed two contrasting true-breeding plants with two different traits for a given characteristic.
Mendel labeled the offspring of the first plants bred F1, for the first flower generation.
Chapter 12 Solutions
Biology 2e
Ch. 12 - Figure 12.5 In pea plants, round peas (R) are...Ch. 12 - Figure 12.6 What are the genotypes of the...Ch. 12 - Figure 12.12 What ratio of offspring would result...Ch. 12 - Figure 12.16 In pea plants, purple flowers (P) are...Ch. 12 - Mendel performed hybridizations by transferring...Ch. 12 - Which is one of the seven characteristics that...Ch. 12 - Imagine you are performing a cross involving seed...Ch. 12 - Consider a cross to investigate the pea pod...Ch. 12 - A scientist pollinates a true-breeding pea plant...Ch. 12 - The observable traits expressed by an organism are...
Ch. 12 - A recessive trait will be observed in individuals...Ch. 12 - If black and white true-breeding mice are mated...Ch. 12 - The ABO blood groups in humans are expressed as...Ch. 12 - In a mating between two individuals that are...Ch. 12 - If the allele encoding polydactyly (six fingers)...Ch. 12 - A farmer raises black and white chickens. To his...Ch. 12 - Assuming no gene linkage, in a dihybrid cross of...Ch. 12 - The forked line and probability methods make use...Ch. 12 - How many different offspring genotypes are...Ch. 12 - Labrador retriever's fur color is controlled by...Ch. 12 - Which of the following situations does not follow...Ch. 12 - Describe one of the reasons why the garden pea was...Ch. 12 - How would you perform a reciprocal cross for the...Ch. 12 - Mendel performs a cross using a true-breeding pea...Ch. 12 - Calculate the probability of selecting a heart or...Ch. 12 - The gene for flower position in pea plants exists...Ch. 12 - Use a Punnett square to predict the offspring in a...Ch. 12 - Can a human male be a carrier of red-green color...Ch. 12 - Why is it more efficient to perform a test cross...Ch. 12 - Use the probability method to calculate the...Ch. 12 - Explain epistatis in terms of its Greek-language...Ch. 12 - In Section 12.3, ''Laws of Inheritance," an...Ch. 12 - People with trisomy 21 develop Down’s syndrome....Ch. 12 - A heterozygous pea plant produces violet flowers...
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- Why was the garden pea a good choice as an experimental organism in Mendel’s work?arrow_forwardThe diagram below describes the relationships of genes, alleles, and loci of genetics and how a genotype manifests as a phenotype using the pea plant flower as an example. In this case, the genotype is heterozygous, meaning that the plant carries two different alleles of the gene. Think of a scenario where you have a pea plant that is homozygous recessive in flower color. Determine the phenotype of the flower color for this plant and describe how the phenotype is derived based on the information provided in the below diagram. Make sure to include the following terms, gene, allele, locus, enzyme, and gene expression, in your discussion.arrow_forwardDescribe the characteristics of pea plants that make them asuitable organism to study genetically.arrow_forward
- Use the following information to answer the next question. Some Traits in Garden Pea Plants In pea plants, the genes for seed shape, seed colour, and plant height demonstrate independent assortment. The alleles for these genes are symbolized as follows: R (round) >r (wrinkled) Y (yellow) > y (green) Answer: Seed shape Seed colour - Plant height T (tall) > t (short) What percentage of the gametes produced by a pea plant heterozygous for both seed shape and seed colour would be expected to contain both the allele for wrinkled and the allele for green? (Record your answer as a whole number. Do not include the percentage sign)arrow_forwardGregor Mendel followed specific steps when breeding pea plants to determine the underlying cause and mathematical ratio of specific traits. Drag and drop the four tiles that describe the order of his process and findings.arrow_forwardUsing Mendel’s lines of peas, describe how you would use a test cross experimental design to determine the genotype of a pea plant with purple flowers. Be very specific in describing your experimental design and how you would interpret your results based on the proportion of offspring phenotypes. Make sure to include all possible offspring phenotypes in your answer and what the proportion of phenotypes tells you about the purple plant genotype.arrow_forward
- You identify a gene that determines the size of the pods of a pea plant. To study the phenotype associated with this trait, you cross a plant that is homozygous for the “long pod” allele with a pea plant that is homozygote for “short pod” allele. When measuring the length of the pods of the parents and resulting offspring, you obtain the following data: Plant Length (cm) Homozygous (“Wide” allele) 15 cm Homozygous (“Short” allele) 4 cm Resulting cross breed 9 cm What can you conclude about this phenotype/trait? Long and short alleles are codominant Wide allele shows incomplete dominance over the short allele Wide allele shows complete dominance over the short allele Short allele shows complete dominance over the long allele The wide and short genes are linkedarrow_forwardExplain at least 3 factors that make corn more ideal than humans for studying inheritance patterns. Please provide explanation.arrow_forwardWhat is the role of chance and direction in determining the phenotype of an organismarrow_forward
- Why was Mendel’s success dependent on his studying characteristics that exhibit only two easily distinguished phenotypes, such as white versus gray seed coats and round versus wrinkled seeds? Would he have been less successful if he had instead studied traits such as seed weight or leaf length, which vary much more in their phenotype?arrow_forwardin classical genetics what is the expected phenotypic ratio for progeny having a characterirstic such as plant height being controlled by a single gene? how about being controlled by two different genes?arrow_forwardConsider the following case of blending inheritance. A population of plants starts out with an equal number of individuals of heights 40 and 60 cm. The parents mate randomly, and the height of an offspring is exactly equal to the average height of its parents. Find all the ways that the heights of the grandparents average to exactly 50 cm.arrow_forward
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