Imagine That a Researcher Is Looking at a Mutant Arabidopsis

question 46

Multiple Choice

Imagine that a researcher is looking at a mutant Arabidopsis plant that only produces carpels and sepals; stamens and petals are absent. Which of the following statements must be TRUE regarding this plant?

• A)B activity is inhibited in this Arabidopsis mutant.
• B)There is B activity in an abnormal location in this mutant, with B acting in all of the cell whorls.
• C)The only mutation that would explain this phenotype is one that inhibits PISTILLATA.
• D)This plant likely carries a mutation in APETALA-2.
• E)B activity is inhibited in this Arabidopsis mutant, and this plant likely carries a mutation in APETALA-2.

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Definitions:

Chorion

A membrane that surrounds the amnion and becomes the fetal component of the placenta.

Epigenesis

The process by which a new phenotypic form emerges through the interactions of the preceding form and its current environment.

Zygote

The earliest developmental stage of an embryo, formed when a sperm cell fertilizes an egg cell, which then begins to divide and grow.

Germinal Period

The initial two weeks of prenatal development following conception, characterized by rapid cell division and the beginning of cell differentiation.