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Concept explainers
To review:
The possibility that may occur if hairball were expressed in other thoracic segments in both species 1 and 2. Also, it is to be assessed whether this is an example of heterometry, heterotrophy, or heterochrony.
Introduction:
The bristles in Drosophila do not grow on their other two thoracic segments. Hairball is also not expressed at high levels in these segments. During development, a different species 3 has hairs on other thoracic segments and hairball is expressed in these segments of this species.
Heterometery is referred to as the change in the amount of gene expression during the developmental stages of an organism. Heterotrophy is termed as the evolutionary change in the spatial patterning of development. Heterochrony is defined as the change in gene expression timings and developmental rates of an organism.
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Chapter 19 Solutions
EBK LIFE: THE SCIENCE OF BIOLOGY
- What is the opening indicated by the pointer? (leaf x.s.) stomate guard cell lenticel intercellular space none of thesearrow_forwardIdentify the indicated tissue? (stem x.s.) parenchyma collenchyma sclerenchyma ○ xylem ○ phloem none of thesearrow_forwardWhere did this structure originate from? (Salix branch root) epidermis cortex endodermis pericycle vascular cylinderarrow_forward
- Identify the indicated tissue. (Tilia stem x.s.) parenchyma collenchyma sclerenchyma xylem phloem none of thesearrow_forwardIdentify the indicated structure. (Cucurbita stem l.s.) pit lenticel stomate tendril none of thesearrow_forwardIdentify the specific cell? (Zebrina leaf peel) vessel element sieve element companion cell tracheid guard cell subsidiary cell none of thesearrow_forward
- What type of cells flank the opening on either side? (leaf x.s.) vessel elements sieve elements companion cells tracheids guard cells none of thesearrow_forwardWhat specific cell is indicated. (Cucurbita stem I.s.) vessel element sieve element O companion cell tracheid guard cell none of thesearrow_forwardWhat specific cell is indicated? (Aristolochia stem x.s.) vessel element sieve element ○ companion cell O O O O O tracheid O guard cell none of thesearrow_forward
- Identify the tissue. parenchyma collenchyma sclerenchyma ○ xylem O phloem O none of thesearrow_forwardPlease answer q3arrow_forwardRespond to the following in a minimum of 175 words: How might CRISPR-Cas 9 be used in research or, eventually, therapeutically in patients? What are some potential ethical issues associated with using this technology? Do the advantages of using this technology outweigh the disadvantages (or vice versa)? Explain your position.arrow_forward
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