In a bird species, the amount of male brood care is positively correlated with offspring survival
A father's contribution is, however, completely unrelated to the amount of brood care his mature sons provide. What is the likely explanation for male brood care?
a. intersexual selection via direct benefits
b. sexual selection for good genes via an honest signal
c. male response to environmental factors
d. no sexual selection as there is no fitness consequence to male brood care
C
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If a cross section of a eudicot herbaceous stem were compared with the cross section of its root the primary difference would be.
A. location of dermal tissue B. location of ground tissue C. location of vascular tissue D. location of terminal buds E. All of the choices are correct
Red light and phytochrome are involved in which of the following plant growth responses? Check all that apply.
_____ thigmotropic responses _____ inhibition of seed germination _____ elongation of etiolated shoots _____ detection of crowding by neighboring plants
The loss of genetic diversity in crop plants can become disastrous. The Irish Potato Famine is an example of this problem. Which of the following is NOT a correct statement about the Irish Potato Famine?
A) Most of the potatoes in Ireland were propagated from cuttings of the same plant. B) Most of the potatoes in Ireland were genetically the same. C) When the crops were infected by a rot-causing mold, all of the potato plants were susceptible and most were wiped out. D) The potato originated in Ireland. E) In the mid-1800s, much of the population of Ireland depended on potatoes.
Under ideal conditions, prokaryotes are capable of reproducing at a decreased rate.
a. true b. false