A cross between a short pea plant and a tall pea plant results in a 1:1 genotypic and phenotypic ratio in the offspring. What are the genotypes of the parent plants?
What will be an ideal response?
Ss × ss (heterozygous × homozygous recessive)
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. A plant physiologist treats a leaf with abscisic acid and observes that the stomata close. What happened inside the guard cells during the experiment?
A. Abscisic acid influences the movement of sodium ions out of the guard cells. B. Abscisic acid influences the movement of potassium ions out of the guard cells. C. Abscisic acid binds carbon dioxide and causes carbonate crystals to block the stomatal opening. D. Abscisic acid binds with auxins and induces water molecules to exit the guard cells. E. Abscisic acid causes the guard cells to become more turgid.
Frogs and toads belong to the ____ lineage
a. Caudata b. Aves c. Squamata d. Gymnophiona e. Anura
Where does heart excitation originate?
a. atrioventricular node b. intercalated disk c. sinoatrial node d. pericardium e. all cardiac muscle fibers simultaneously
Which hormone deficiency would lead to a female that is not ovulating?
A. follicle-stimulating hormone B. epinephrine C. cortisol D. testosterone E. calcitonin