BIO325H5 Lecture 2: Lecture 2 Includes structure of the cricket

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amaranthraccoon190

16 Oct 2011

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Katydids are insects in the order orthoptera, close relatives of crickets. Males broadcast an acoustic signal to attract females for mating. Ears located on proximal end of fore tibiae. Scudderia curvicauda species offer a good example of forewings (and hind wings) functional in both flight and stridulation macropterous: full wings exceed body length. No relation between tooth rate and carrier between tooth rate and sound radiator"s resonant frequency sound that is produced is a broad space of energy. Crickets: calling songs are made by males rubbing their forewings together: usually right over left with bilateral wing symmetry: resonant stridulation they also listen with ears located on their fore tibiae. Most species of cricket produce songs with a pure-tone carrier frequency (high q) near 4. 5 khz. Wavelength produced is 7 cm which is larger than a typical cricket.

Related Questions

1.Why would you predict that females in species with internal fertilization and long periods of gestation would be choosier in selecting their mates than females in other species that lack these traits?

2.As we talked about in elephant seals, in many species, there is much greater variance in male reproductive success than in female reproductive success. This could result from a few dominant males controlling the access to the breeding grounds the females need to give birth. There are other ways, however, to get the same pattern of variance in male reproductive success WITHOUT males controlling access to a resource or to females. How might you get the same variance in male reproductive success via intersexual selection?

Evolution and Speciation

Define evolution. Why is it inaccurate for creationists to tout evolution as âjust a theoryâ? (Think about what theory actually means in scientific terms vs. the use of the word âtheoryâ in casual conversations).

Explain what the Hardy-Weinberg equilibrium shows and describe the conditions necessary for the equilibrium to be maintained.

Explain what factors cause populations to diverge from the Hardy- Weinberg equilibrium and how each factor causes the change.

Describe how species evolve via natural selection. (Be sure to discuss the key aspects of natural selection: variation, heredity differential survival and reproductive success in your answer).

What does speciation mean and how can it occur?

What does adaptation mean? Why is natural selection the only agent of evolutionary change that leads to adaptation? (Think about how natural selection works).

Is natural selection all powerful? Can it create any variation that you or I could think of? Why or why not?

Differentiate between natural and sexual selection.

What is reproductive isolation?

Describe prezygotic and postzygotic mechanisms of reproductive isolation and explain how they can contribute to speciation.

Distinguish between allopatric and sympatric speciation and explain how each leads to new species.

What is adaptive radiation?

Be able to read and interpret phylogenetic trees: be able to determine which species are most closely related to each other, what nodes represent, where common ancestors would be located, etc.

What are paraphyletic, polyphyletic and monophyletic groups within a phylogeny?

viridianmanatee515

Although we generally think of plants and animals as having sexual reproduction, many species can reproduce sexually or asexually. As a consequence, populations of the same species can differ in the proportion of reproduction that is sexual vs. asexual. How will this influence linkage disequilibrium between two loci?

a. Linkage disequilibrium will be relatively high in populations with high frequencies of sex because recombination tends to create linkage disequilibrium.

b. Linkage disequilibrium will be relatively low in populations with high frequencies of sex because recombination tends to create linkage disequilibrium.

c. Linkage disequilibrium will be relatively high in populations with low frequencies of sex because recombination tends to destroy linkage disequilibrium.

d. Selection will tend to destroy linkage disequilibrium in high sex populations.

e. Selection will tend to destroy linkage disequilibrium in low sex populations.

sangriaporcupine510

BIO325H5 Lecture 2: Lecture 2 Includes structure of the cricket

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