The change from indirect development to direct development in sea urchins illustrates the following concepts: (choose all that apply)
_____ Differences in gene expression patterns can cause major changes in development.
_____ An organism can arrive at the same adult body plan in different ways.
_____ Changing the mode of development requires evolving a lot of new genes.
_____ Urchins have a unique genome that is especially suited to major developmental changes.
_____ Once a lineage evolves a mode of development, it becomes “locked in”.
_____ Radially symmetric organisms are subject to different evolutionary pressures than bilateral organisms.
_____ Chromosomal deletions have major effects on development.
__X__ Differences in gene expression patterns can cause major changes in development.
__X__ An organism can arrive at the same adult body plan in different ways.
_____ Changing the mode of development requires evolving a lot of new genes.
_____ Urchins have a unique genome that is especially suited to major developmental changes.
_____ Once a lineage evolves a mode of development, it becomes “locked in”.
_____ Radially symmetric organisms are subject to different evolutionary pressures than bilateral organisms.
_____ Chromosomal deletions have major effects on development.
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The concept of niche is best described as ________
a. a population's specific requirements for food b. all the biological and physical activities and interactions necessary for survival and reproduction c. the total number of animals in the population whose needs are met d. the condition occurring when the birth rate and death rate are equal
Which of the following statements is correct?
A. Transcription is the process of making RNA B. Transcription is the process of making DNA C. Translation is the process of making RNA D. Translation is the process of making DNA
Which lineage do salamanders belong to?
a. Gymnophiona b. Aves c. Urodela d. Anura
You isolate a cell with the following characteristics: (1 ) no nucleus, (2 ) only a single type of organelle, and (3 ) 2 ?m in size. This cell could be a/an:
A) animal cell. B) plant cell or an animal cell. C) plant cell. D) bacterial cell or a plant cell. E) bacterium.