Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 23, Problem 2RQ
As shown in Figure 23.25, there is considerable variation in the facial features of humans. Explain this fact in terms of the concept of the gene pool.
Figure 23.25 Humans show a great deal of variation in their outward appearance. (Top: Rodriguez/ Fancy/Jupiterimages; Bottom left: © Owen Franken/Corbis; Bottom right: Christopher Briscoe/Photo Researchers, Inc)
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Hello! I am a 7th grade science teacher. I have 16 students, and I was wondering if this app was good enough to get the premium package for my students. If you solve these questions below correctly, I will buy the premium package for my 16 students. (Picture below)
IMPORTANT: Give 1-3 (7th grade science info) good sentences explaining why you picked your answer.) (I don’t want collage/high school information about migration. Just an easy explanation please)
Choose one human multifactorial condition and describe it in detail. Include a description of the condition, possible genetic and environmental components that cause the condition as well as an explanation of why it is difficult to study multifactorial conditions. Include references.
PDF
https://www.genetics.edu.au/PDF/Environmental_and_genetic_interactions_fact_sheet-CGE.pdf
Which of the following statements about the grandmother hypothesis is correct?
This is a hypothesis used to explain why grandmothers tend to live longer than grandfathers.
For this hypothesis to work, a grandmother will need to have an antagonistic pleiotropic mutation that extends her lifespan but also lessens her physical activities.
Because grandmothers are older, so they tend to contribute less in a family. That is, grandmothers are usually a drain of resources for a family.
The evolution of monthly menstrual cycle in human females is seen as an example explained by the grandmother hypothesis.
None of the above
Chapter 23 Solutions
Human Biology (MindTap Course List)
Ch. 23 - Prob. 1RQCh. 23 - As shown in Figure 23.25, there is considerable...Ch. 23 - Prob. 3RQCh. 23 - Prob. 4RQCh. 23 - Prob. 5RQCh. 23 - Prob. 6RQCh. 23 - Prob. 1SQCh. 23 - The relative numbers of different genes (alleles)...Ch. 23 - A difference in survival and reproduction among...Ch. 23 - The fossil record of evolution correlates with...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- The tiny frog Paedophryne amauensis was discovered by researchers purposefully searching for the source of an unusual sound, but sometimes similarity between two species can lead scientists to accidental discoveries. A previously unknown species of wild cat was inadvertently discovered by researchers who were sequencing the DNA of a house cat–sized South American wild cat called the tigrina. The DNA analysis revealed that many alleles found in the supposed tigrinas living in northeastern Brazil are not shared with other tigrinas. This finding suggested that the northeastern cats do not interbreed with other tigrinas and are therefore a different species. What prevents the two species from interbreeding?arrow_forwardGiven our understanding of modern human genetic variation, why is the concept of race a biological fallacy? Edit View Insert Format Tools Table 12pt V Paragraph | :arrow_forwardThe gene density for each organism is shown in the last column of this data table. Organism Size of genome (base pairs) Size of Genome (Mb) Number of Genes Gene density (genes per Mb) H. influenzae (bacterium) 1.8 million 1.8 1700 944 S. cerevisiae (yeast) 12 million 12 6300 525 E. coli (bacterium) 4.6 million 4.6 4400 957 C. elegans (roundworm) 100 million 100 20100 201 D. melanogaster (fruit fly) 165 million 165 14000 85 A. thaliana (mustard plant) 120 million 120 25500 213 O. sativa (rice) 430 million 430 42000 98 H. sapiens (human) 3.0 billion 3000 21000 7 R. norvegicus (lab rat) 2.8 billion 2800 20000 7 P. troglodytes (chimanzee) 3.1 billion 3100 20000 6. M. mulatta (macaque) 2.9 billion 2900 22000 8 O.anatinus (duck-billed platypus) 1.8 billion 1800 18500 10 P. persica (peach) 227 million 227 27900 123 Use the table to identify three statements that are true regarding the genomes of organisms. More complex organisms (e.g., vertebrates) generally have larger genome sizes. An…arrow_forward
- In addition to physical traits, gene sequences can be used when comparing related species. Instead of looking for the presence or absence of a specific gene, you would look at the percent similarity between the same gene in two or more species. Therefore, it is important to select a gene that contains a similar DNA gene sequence in each of the species being compared. Certain genes are involved in processes that are required for basic cellular function. As these processes are critical to cell function, the genes that regulate them are highly conserved, meaning that they have remained essentially unchanged over time. Glycolysis is one such process that is critical for cellular metabolism. Glycolysis involves converting glucose into pyruvate in order to generate ATP, the energy currency of the cell. Because glycolysis is an essential process for all species, the genes involved are therefore highly conserved. You will be looking at similarities among different taxa of the highly conserved…arrow_forwardAn important application of DNA fingerprinting is relationship testing. Persons who are related genetically have some bands or peaks in common. The number they share depends on the closeness of their genetic relationship. For example, an offspring is expected to receive half of his or her minisatellites from one parent and the rest from the other. The diagram shown here schematically illustrates traditional DNA fingerprints of an offspring, mother, and two potential fathers. In paternity testing, the offspring’s DNA fingerprint is first compared with that of the mother. The bands that the offspring have in common with the mother are depicted in purple. The bands that are not similar between the offspring and the mother must have been inherited from the father. These bands are depicted in red. Which male could be the father?arrow_forwardAsthma is a common medical condition that is influenced by genetics and environment. In the US, appraximately 9% of adults have asthma. A recent genome wide association study (GWAS) identifieda genetic variation that increases asthma risk by S0% when a single copy of the risk variant is present in a genome. Which value below would represent the approximate asthma risk of an individual with this genetic variation in their genome? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a 59% b 50% 14.5% 9.5% e 9%arrow_forward
- Introgression from Neandertal and Denisovan relatives in our past has resulted in many humans around the world having alleles derived from these extinct ancestors. Describe one allele attributed to Neandertals and one allele attributed to Denisovans in humans today. For your descriptions, include the role of the gene(s) that the allele is(are) linked to, what benefit or feature they are proposed to contribute to, and the population(s) that carry the allele. A Denisovan or Neandertal haplotype would also be suitable.arrow_forwardScientists at Bikini Bottoms have been investigating the genetic makeup of the organisms in this community. Use the information provided and your knowledge of genetics to answer each question. For each genotype below, indicate whether it is heterozygous (Hetz) OR homozygous (Homz). TT _____ Bb _____ DD _____ Ff _____ tt _____ dd _____ Dd _____ ff _____ Tt _____ bb _____ BB _____ FF _____ Which of the genotypes in #1 would be considered purebred? ________________________________ Which of the genotypes in #1 would be hybrids? __________________________________________arrow_forwardMAKE A simple sketch and label characteristics Choose a human-related organism to study. As you consider strategies to enhance the social value of this organism, think of other desirable attributes that may be added to it. Imagination is a powerful tool, so let it go wild and imagine that you can transfer genes across other animals. For example: A gene from a firefly has been transferred into tobacco plants so that they may glow in the dark, as demonstrated by geneticists. Tobacco pests are less likely to attack at night because of this.arrow_forward
- An ancestral gene "Stacin" is involved in initiating parental care in both males and females. The stacin gene duplicates and mutations arise in both copies that change the function. One copy becomes specialized to function in male parental care "Patristacin" and the other copy becomes specialized to function in female parental care "Matristacin". Which of the following terms best describes this change in function in the two sequences? Group of answer choices Profunctionalization Prefunctionalization Subfunctionalization Neofunctionalizationarrow_forward(Practice Hint: Click or tap your finger on the text in the box to make your selection.) A student is researching why domestic cats often have white patches of fur. The student reads the paragraph shown and makes the following conclusion: "Domestic cats with white fur evolved from wildcats through artificial selection." Select the sentence in the paragraph that best supports the student's conclusion. During embryonic development, certain stem cells determine whether a kitten will be born with solid-color fur or with white patches of fur. Wildcats are the genetic ancestors of the domestic cat and have fur color that blends into their environment. Wildcats that eliminated pests and were less afraid of humans were useful for protecting harvested grains. These cats were cared for by humans and were selected to reproduce. O During embryonic development, certain stem cells determine whether a kitten will be born with solid-color fur or with white patches of fur. Wildcats are genetic…arrow_forwardAn experiment has been initiated in a laboratory where recombinant DNA technology has been used to substitute the gene responsible for change of colour in chameleon with another gene responsible for “glowin-the-dark”. If this experiment is successful, chameleons carrying the “glow-in-the-dark” gene will not be able to change their colours any longer. Discuss the implication of these results in terms of ethics and conservation biology.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Human Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage Learning
Human Biology (MindTap Course List)
Biology
ISBN:9781305112100
Author:Cecie Starr, Beverly McMillan
Publisher:Cengage Learning
How to solve genetics probability problems; Author: Shomu's Biology;https://www.youtube.com/watch?v=R0yjfb1ooUs;License: Standard YouTube License, CC-BY
Beyond Mendelian Genetics: Complex Patterns of Inheritance; Author: Professor Dave Explains;https://www.youtube.com/watch?v=-EmvmBuK-B8;License: Standard YouTube License, CC-BY