Domanda del libro di testo
Propose an experiment to test the hypothesis that cells from only one region of a frog blastula form the ectoderm. What results from this experiment would support this hypothesis?
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Ch. 47 - Animal Reproduction and Development
Freeman8th EditionBiological ScienceISBN: 9780138276263
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TOC.tableOfContents
- Ch. 1 - Biology: The Study of Life13
- Ch. 2 - Water and Carbon: The Chemical Basis of Life14
- Ch.3 - Protein Structure and Function10
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells11
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation11
- Ch. 10 - Photosynthesis12
- Ch. 11 - Cell-Cell Interactions12
- Ch. 12 - The Cell Cycle8
- Ch. 13 - Meiosis12
- Ch. 14 - Mendel and the Gene23
- Ch. 15 - DNA and the Gene: Synthesis and Repair15
- Ch. 16 - How Genes Work16
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria16
- Ch. 19 - Control of Gene Expression in Eukaryotes12
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers15
- Ch. 21 - Genes, Development, and Evolution12
- Ch. 22 - Evolution by Natural Selection16
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea15
- Ch. 27 - Diversification of Eukaryotes16
- Ch. 28 - Green Algae and Land Plants16
- Ch. 29 - Fungi18
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals15
- Ch. 32 - Deuterostome Animals17
- Ch. 33 - Viruses16
- Ch. 34 - Plant Form and Function16
- Ch. 35 - Water and Sugar Transport in Plants16
- Ch. 36 - Plant Nutrition13
- Ch. 37 - Plant Sensory Systems, Signals, and Responses16
- Ch. 38 - Flowering Plant Reproduction and Development16
- Ch. 39 - Animal Form and Function17
- Ch. 40 - Water and Electrolyte Balance in Animals16
- Ch. 41 - Animal Nutrition16
- Ch. 42 - Gas Exchange and Circulation16
- Ch. 43 - Animal Nervous Systems16
- Ch. 44 - Animal Sensory Systems16
- Ch. 45 - Animal Movement11
- Ch. 46 - Chemical Signals in Animals16
- Ch. 47 - Animal Reproduction and Development16
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology15
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology17
- Ch. 54 - Biodiversity and Conservation Ecology18
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Capitolo 47, Problema 10
The BMI z-score is a relative measure of body mass index (BMI) that takes into account age. Higher values represent heavier individuals for a given height. The table here shows the BMI z-score of pre- and post-pubertal girls at three ages.
Which of the following conclusions can you draw from the data?
a. At a given age, there are more girls with low BMI z-scores than with high BMI z-scores.
b. At a given age, girls with high BMI z-scores are more likely to have begun puberty than girls with low BMI z-scores.
c. Girls 11, 12, and 13 years of age are equally likely to have begun puberty.
d. There is no relationship between BMI z-score and age of beginning puberty.
Guida verificata passo dopo passo1
Examine the table to understand the relationship between age, BMI z-score, and pubertal status. Note that the table provides BMI z-scores for pre-pubertal and post-pubertal girls at ages 11, 12, and 13.
Observe that for each age group, the BMI z-score is higher for post-pubertal girls compared to pre-pubertal girls. This suggests a trend where girls with higher BMI z-scores are more likely to have begun puberty.
Consider option a: 'At a given age, there are more girls with low BMI z-scores than with high BMI z-scores.' The table does not provide information on the number of girls, only the average z-scores, so this conclusion cannot be drawn.
Consider option b: 'At a given age, girls with high BMI z-scores are more likely to have begun puberty than girls with low BMI z-scores.' The data supports this conclusion as post-pubertal girls have higher BMI z-scores at each age.
Consider options c and d: 'Girls 11, 12, and 13 years of age are equally likely to have begun puberty' and 'There is no relationship between BMI z-score and age of beginning puberty.' The data shows a decrease in BMI z-score with age for post-pubertal girls, suggesting a relationship between BMI z-score and pubertal status, thus these options are not supported.
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BMI z-score
The BMI z-score is a statistical measure that indicates how a person's body mass index (BMI) compares to a reference population, adjusted for age and sex. A z-score of 0 represents the average BMI for a specific age group, while positive values indicate above-average BMI and negative values indicate below-average BMI. This measure is particularly useful in assessing growth patterns in children and adolescents.
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Puberty and its effects on BMI
Puberty is a developmental stage characterized by physical and hormonal changes that lead to sexual maturity. During this period, individuals often experience significant changes in body composition, including increases in muscle mass and fat distribution, which can affect BMI. Understanding the timing of puberty is crucial for interpreting BMI z-scores, as those who have begun puberty may show higher BMI z-scores compared to their pre-pubertal peers.
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Interpreting data from tables
Interpreting data from tables involves analyzing numerical values to draw conclusions about trends or relationships. In this case, the table presents BMI z-scores for pre- and post-pubertal girls at different ages, allowing for comparisons between groups. Recognizing patterns, such as the increase in post-pubertal BMI z-scores and the decrease in pre-pubertal scores with age, is essential for answering questions about the relationship between BMI and puberty.
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In the 1960s, the U.S. Food and Drug Administration approved a contraceptive that allowed women to plan desired pregnancies and prevent unwanted pregnancies. Oral hormonal contraception ('the pill') uses synthetic hormones similar in structure to progesterone and/or estradiol. What is the pill's mechanism of action?
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In the 1960s, the U.S. Food and Drug Administration approved a contraceptive that allowed women to plan desired pregnancies and prevent unwanted pregnancies. Oral hormonal contraception ('the pill') uses synthetic hormones similar in structure to progesterone and/or estradiol. What is the pill's mechanism of action?
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b. Diaphragm
c. Withdrawal
d. The pill
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How do spermatogenesis and oogenesis in humans differ with respect to numbers of cells produced, gamete size, and timing of the second meiotic division?
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