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Concept explainers
To review:
The number of gene duplications and losses, which are likely to have occurred in the history of a gene family of the genomes of humans, chimpanzees, and gorillas.
Given:
The figure given below shows the gene tree derived from the genomes of humans, chimpanzee, and gorilla.
Introduction:
Gene duplication is a way in which the genomes acquire new functions. In gene duplication, one copy of the gene is made free from carrying out the original function. The gene duplication can have many outcomes. Both the genes can either retain their original function or both may have the ability to produce the original gene, but they may have the ability to diverge in different tissues at different times. One gene may become incapacitated and the other one may have the original function and the second may perform differently.
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Chapter 23 Solutions
LIFE: THE SCIENCE OF BIOLOGY
- Identify 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_forwardIdentify the indicated tissue. (Tilia stem x.s.) parenchyma collenchyma sclerenchyma xylem phloem none of thesearrow_forward
- Identify 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_forwardWhat type of cells flank the opening on either side? (leaf x.s.) vessel elements sieve elements companion cells tracheids guard cells none of thesearrow_forward
- What 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_forwardIdentify the tissue. parenchyma collenchyma sclerenchyma ○ xylem O phloem O none of thesearrow_forward
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