Concept explainers
Using the graph in figure 30.13, calculate the pollen tube growth rate, being sure to show your work. Compare your rate with the rate in the table in figure 30.13 and propose an explanation for any differences.
To calculate: The pollen tube growth rate using the graph in the given question.
Introduction: Plants are multicellular, predominantly photosynthetic eukaryotes. They belong to the kingdom Plantae. Seed plantsare defined as plants that bear seeds. The two major types of seed plants are angiosperms and gymnosperms.
Explanation of Solution
The pollen tube is a tube through which the sperm from the pollen reaches the egg cells and fertilizes the plant to form seeds. The pollen grains are carried to the female gametophyte by a pollinator or wind. The growth rate of the pollen tube is calculated as (640 µm -80 µm)/(8 hr -1 hr) = 80 µm/hr using the graph in the given question.
To compare: The rate of pollen tube growth calculated by an individual with the rate in the table given in the question and propose an explanation for any differences.
Explanation of Solution
The growth rate of the pollen tube calculated by an individual with the rate in the table given in the question matches the value in the data table. The difference could be the result of reading the graph incorrectly or by rounding offduring calculation.
Want to see more full solutions like this?
Chapter 30 Solutions
1 SEM CARDLESS ACC W/RAVEN TEXT
- Table 1. Kepler 22B taxonomic diversity with derived characters. Taxon Skin Basis for building # Legs # Data- # Sexes Powered X-ray Interdimensional Color macromolecules ports Flight? Vision Awareness? A Green Carbon 4 4 2 N N N B Green Carbon 2 4 2 N N N C Green Silicon 2 4 1 N N N D Green Silicon 2 4 2 N Y N E Purple Silicon 2 4 2 N Y N F Purple Silicon 2 4 2 N Y Y G Purple Silicon 2 5 2 N Y Y H Purple Silicon 2 5 2 Y Y Yarrow_forwardGlobal climate change is expected to result in drastic changes in precipitation patterns. This might mean that, due to the rain shadow effect, the windward sides of mountains might be wetter, while the leeward sides of mountains might be drier. Using what you know about plant taxonomy and ecological relationships, propose a justified, ecological hypothesis on how plant community composition would change on each side of the mountain. Your answer should contain two parts: The hypothesis and the ecological justification addressing the bold points above.arrow_forwardExplain why homologies are used in constructing phylogenetic trees (2 pts). Give two specific examples of how using analogous characters would result in a tree depicting incorrect evolutionary relationships (4 pts). Aarrow_forward
- D B - E C - A - Farrow_forwardDiscuss briefly the research on the effects of marijuana smoking on the functioning of the immune system.arrow_forward1) Describe how you would test the hypothesis that lobe eyes are a dominant lethal gene. Run the experiment and see if your hypothesis is correct. b) What are the possible body colors in fruit flies? Place an asterisk next to the wild type body color. c) Draw a fly with star-shaped eyes next to one with lobe eyes and insert your drawing below.arrow_forward
- Utilizing the following pedigree, and the key for phenotypes, to the right of it, determine the genotypes of the individuals in the pedigree for blood type inheritance. Individual Blood Type I1 I2 II1 II2 II3 II4 III1 III2 III3 III4 III5 III6arrow_forwarda)At what wavelength (nm) on a spectrometer can this color be quantified? b) Record your results. Indicate on this page which boxes turned color. A B C + - 1:2 1:10 1:100 c) Based on these results, which patient(s) definitely have lupus, which definitely do not, and which require further testing?arrow_forwarda) Which dog breed has the ancestral allele for all three genes, similar to gray wolves? b)Which dog breeds have a more recent allele for FGF5 but an ancestral allele for KRT71? c)Which coat type is the ancestral allele of the KRT71 gene associated with? d)How might understanding the functions of genes in dogs help us better understand human health?arrow_forward
- If a girl has ptosis and then she marries a man who is a normal eyes, what will be the phenotypic and genotypic ratio of their offspring? 2) Create a small pedigree, noting sex of each individual as well as whether or not they are affected with ptosisarrow_forwarda) Which types of SNPs might be identified in a GWAS? b)Give two possible reasons for why a SNP would be associated with a trait like fur color. c)Which SNP in Table 1 do you think is completely associated with fur color? Explain the reasoning for your choice.arrow_forwarda) Which SNPs in Table 1 do you think are completely unassociated with fur color? Explain the reasoning for your choices. (Hint: There are five in total.) b) Which SNP in Table 1 do you think has the next strongest association with fur color, after the completely associated SNP you identified two questions ago? Explain the reasoning for your choice. c) Describe a specific problem or question that you could investigate by doing a GWAS with the organism you want to discussarrow_forward