Below is a graph on horned beetles. Choose the statements that accurately depict the results. In beetles that have a body size under 4.5mm, horn length is us less than 2 mm. In order to have horns that are over 4mm a beetle needs to be over 5 mm in size. Beetles that are between 4.5 and 5 mm have no horns. The amount of nutrition is thought to play role in growth of horns, with poor nutrition leading to no horns and small size and good nutrition leading to a larger size and horns.
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5mm, horn length is usually less than 2 mm. This statement is accurate based on the observation from the graph. Show more…
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. In beetles, body color is determined by an autosomal gene with two alleles, where B is incompletely dominant to b such that BB beetles are black, Bb beetles are brown and bb beetles are yellow. An X-linked gene determines body size, with normal size (M) completely dominant to miniature body size (m). Male beetles are heterogametic (XY). Pure-breeding female beetles with black miniature sized bodies were crossed to male beetles with yellow normal sized bodies to generate F1 progeny. F1 males and females were then mated to produce an F2 generation. Based on this information, which of the following statements is FALSE? A. All F1 males are brown with miniature bodies. B. 1/16 of the F2 progeny will be females with yellow miniature bodies. C. ÂĽ of the F2 progeny have brown, normal sized bodies. D. All F1 females are brown with normal size bodies. E. Âľ of the F2 progeny have black body color.
Bryan V.
A species of beetle can be either black or brown in color. The beetle's color is determined by a single gene, and black is recessive to brown. The soil in the area has become darker and closer in color to the black beetles. Which of the following will most likely occur? Selective pressures will decrease the number of brown beetles. Selective pressures will increase the number of brown beetles. Selective pressures will decrease the number of black beetles. The overall size of the beetle population will continue to decrease over time.
Adi S.
In a hypothetical population of beetles, there is a wide variety of color, matching the range of coloration of the tree trunks on which the beetles hide from predators. The graphs below illustrate four possible changes in the beetle population as a result of a change in the environment due to pollution that darkened the tree trunks. What would be the most likely change in the coloration of the beetle population after pollution and why? a. The coloration range shifted toward more lightcolored beetles, as in diagram I. The pollution helped the predators find the darkened tree trunks. b. The coloration in the population split into two extremes, as in diagram II. Both the lightcolored and the dark-colored beetles were able to hide on the darker tree trunks. c. The coloration range became narrower, as in diagram III. The predators selected beetles at the color extremes. d. The coloration in the population shifted toward more dark-colored beetles, as in diagram IV. The light-colored beetles were found more easily by the predators than were the dark-colored beetles.
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