Which structure can still develop normally in an embryo with mutations in both the SHOOTMERISTEMLESS (stm) gene and the HOBBIT gene?
A. root cap
B. shoot apical meristem
C. root apical meristem
D. leaf primordia
E. cotyledons
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about meristems? What other information is related to the question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
E. cotyledons
Clarify Question
What is the key concept addressed by the question?
· This question is asking about the effects of a mutation in the SHOOTMERISTEMLESS and HOBBIT genes.
What type of thinking is required?
· Apply level:
o You are being asked to take what you already know and apply it to the consequences of gene mutations in a growing plant.
Gather Content
What do you already know about meristems? What other information is related to the question?
· The SHOOTMERISTEMLESS gene is responsible for shoot apical meristem formation.
· The HOBBIT gene plays a role in causing the formation of the root meristem.
· Meristem contains undifferentiated cells that give rise to other structures, and is found in areas of plants where growth can take place.
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
· Leaf primordia and root caps are derived from the root and shoot meristems that are coded for by the mutated genes, so these structures should not be expected to form.
· The cotyledons develop as a result of the action of other genes, so they would develop normally..
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
· Apply level:
o Answering this question correctly depended on your ability to use the functions of genes in a new situation. If you got an incorrect answer, did you remember that the SHOOTMERISTEMLESS gene gives rise to the shoot apical meristem: the HOBBIT gene plays a role in root meristem formation: or that meristem tissue is the foundation for other structures? Did you have trouble extending the functions of genes to determine the correct answer?
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