Natural selection would appear to act against long tails in male red-collared widowbirds, given that longer tails reduce body condition over the mating season
Based on the experiments of Pryke and Andersson (2005 ), why do long tails appear to be favored despite their obvious disadvantage?
Long tails are favored in male red-collared widowbirds because females of the species are choosy, and they select mates based on longer tail length.
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Acridine dyes are mutagens that
A) disrupt the reading frame of the gene. B) replace an AT base pair with a GC base pair. C) reverse the polarity of the double helix. D) kill cells.
Which of the following is not involved in the increase in blood volume in a pregnant woman?
A. renin-angiotensin-aldosterone mechanism B. an increase in blood oxygen levels C. artery expansion D. progesterone E. sodium and water retention
Which factor initiates the intrinsic clotting mechanism?
a. factor X b. factor XI c. factor ACI d. thrombin e. prothrombin activator
Crop plants have been protected from certain insects by the addition of a gene for a specific insect toxin from the bacterium
A. Agrobacterium tumefaciens. B. Bacillus thuringiensis. C. tobacco mosaic. D. Herpes simplex. E. Pseudomonas.