Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Textbook Question
Chapter 13.4, Problem 1CC
What is the original source of Variation among the different alleles of a gene?
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What is the term for situations in which a single functional allele of a gene is unable to mask an allele that deletes the gene completely?
In poultry, two independently assorting genes together determine the structure of the comb. Thus, when R is the only dominant allele present, the fowl possesses a rose comb; when P is only dominant allele present, a ‘pea’ comb is produced; when both dominants are present, a ‘walnut’ comb is produced; when only the recessive alleles are present, a ‘single’ comb is obtained.
(a) What are the possible genotypes of all the phenotypes obtainable? Determine the genotype of the parent birds in the following crosses:
(b) Rose x walnut produced 3/8 walnut, 3/8 rose, 1/8 rose, 1/8 pea and 1/8 single offspring.
(c) Walnut x single produced ¼ walnut and ¼ pea, ¼ rose and ¼ single offspring
(d) Rose x pea produced 6 walnut and 5 rose offspring.
How do geneticist normally tell whether an organism exhibiting a dominant phenotype is homozygous or heterozygous for such a trait? Illustrate with an example.
Chapter 13 Solutions
Campbell Biology (10th Edition)
Ch. 13.1 - MAKE CONNECTIONS Using what you know of gene...Ch. 13.1 - How does an asexually reproducing eukaryotic...Ch. 13.1 - WHATIF? A horticulturalist breeds orchids, trying...Ch. 13.2 - MAKE CONNECTIONS In Figure 13.4. how many DNA...Ch. 13.2 - VISUAL SKILLS In The karyotype shown in Figuro...Ch. 13.2 - WHAT IF? A certain eukaryote lives as a...Ch. 13.3 - MAKE CONNECTIONS Comparc tho chromosomes in a...Ch. 13.3 - WHAT IF? After the synaptonemal complex...Ch. 13.4 - What is the original source of Variation among the...Ch. 13.4 - The diploid number for fruit flies is 8, and the...
Ch. 13.4 - Prob. 3CCCh. 13 - Explain why human offifuing resemble their parents...Ch. 13 - Compare the life cycles of animals and plants,...Ch. 13 - Prob. 13.3CRCh. 13 - Prob. 13.4CRCh. 13 - A human cell containing 22 autosomes.and a Y...Ch. 13 - The two homologs of a pair move toward opposite...Ch. 13 - Meiosis II is similar to mitosis in that (A)...Ch. 13 - Prob. 4TYUCh. 13 - If we continue to follow the cell lineage from...Ch. 13 - DRAW IT The diagram shows a cell in meiosis. (a)...Ch. 13 - Explain how you can tell that the cell in question...Ch. 13 - EVOLUTION CONNECTION Many species can reproduce...Ch. 13 - SCIENTIFIC INQUIRY The diagram in quest ion 6...Ch. 13 - Prob. 10TYUCh. 13 - SYNTHESIZE YOUR KNOWLEDGE For selected answers,...
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- Suppose a mutant fruit fly with blue eyes was recently discovered. It is later determined that the blue eye trait is recessive to the wild-type red eye trait. What is the most common way to represent the mutant and wild-type alleles?. Choices are Mutant: Bl, bl Wild-type: Bl+ , re, bl+, or wtarrow_forwardExplain why most loss-of-function alleles are recessive to wild-type, but some are incompletely dominant or (rarely) dominant?arrow_forwardExplain why most loss-of-function alleles (hypomorphic or amorphic) are recessive to wild-type alleles, but some are incompletely dominant or dominant.arrow_forward
- In humans, the genetic disease cystic fibrosis is caused by a recessive allele (a). The normal (healthy) allele is dominant (A). What is the genotype of someone who has cystic fibrosis? What are the two different genotypes that a healthy person could have? If two people were both heterozygous for the cystic fibrosis gene, what fraction of their children would be likely to have this disease? Hint: Draw a Punnett square to figure it out.arrow_forwardDefine wild-type alleles (+)arrow_forwardCite the most common molecular explanations fordominant and recessive alleles.arrow_forward
- In dogs, black fur (B) is dominant over yellow fur (b). A heterozygous black dog is mated with a yellow dog. What are are the phentotype and genotype ratios?arrow_forwardIn sheep, lustrous fleece results from an allele (L) that is dominant over an allele (l) for normal fleece. A ewe (adult female) with lustrous fleece is mated with a ram (adult male) with normal fleece. The ewe then gives birth to a single lamb with normal fleece. From this single offspring, is it possible to determine the genotypes of the two parents? If so, what are their genotypes? If not, why not?arrow_forwardMany people with mutated alleles that are associated with diseases, including some cancers, do not actually develop the disease. How is this possible?arrow_forward
- In Labrador retriever dogs, two alleles (B and b) determine whether coat colour will be black (B)or brown (b). Black coat colour is dominant. A second pair of alleles, E and e, are on a separatechromosome from B and b. The homozygous recessive condition, ee, prevents the expressionof either allele B or b, and produces a dog with a yellow-coloured coat. Some examples ofgenotypes and phenotypes for Labrador retrievers are shown below.Genotype PhenotypeBBEe blackbbEe brownBbee yellow Two dogs, each with the genotype, BbEe, were crossed. What is the percentageprobability that their offspring will have yellow coat colour? (Record your answer as awhole number percentage)arrow_forwardWhat is the difference between multiple alleles and pleiotropy? The combined trait for chevron and patch pattern in clover plants is an example of multiple alleles, whereas pleiotropy refers to parental type for a single character. A character that is influenced by two or more genes refers to multiple alleles, whereas pleiotropy refers to the expression of at least two characters of a single offspring. Multiple alleles consist of alternative versions of a single gene, whereas pleiotropy occurs when mutation exists, resulting in different traits. Multiple alleles signify variations in skin color, whereas pleiotropy exists when there is a mutation especially in the HBB gene resulting in different disorders.arrow_forwardAssume that a gene controls the expression of a trait in which affected children occur only in families where one or both parents are also affected; children who are normal may have parents who are (1) both normal, (2) one normal and one affected, or (3) both affected. Is the gene for the affected condition completely dominant, co-dominant, incompletely dominant or recessive?arrow_forward
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