Evolutionary trees such as this are properly understood by scientists to be

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#Question id: 12756

#Unit 10. Ecological Principles

Flycatcher birds that migrate from Africa to Europe feed their nestlings mostly with moth caterpillars. The data presented show the mean dates of egg laying, hatching, and fledging of flycatcher young, and the 1980 and 2000 peak mass of caterpillars.

The most likely cause for the shift in caterpillar peak mass is

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#Question id: 5227

#Unit 11. Evolution and Behavior

One of the characteristics of retrotransposons is that

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#Question id: 10988

#Unit 7. System Physiology – Animal

What is the normal total delay of the cardiac impulse in the A-V node and the A-V bundle system?

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#Question id: 20414

#Unit 3. Fundamental Processes

Which of following is a gene that contains expressed regions of DNA called exons, split with unexpressed regions called introns (also called intervening regions)

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#Question id: 15191

#Unit 8. Inheritance Biology

Genes that control coat color in mammals represent some of the best early examples of genes with multiple alleles exhibiting different phenotypes. A classic example is the C gene in hamsters. Three of the known alleles of this gene are C, c^k and c^a. Each supplies a different amount of black pigment to the coat hair. The phenotypes of three different homozygous strains are as follows.

Based on the concepts of dominance, determine whether ck and ca were dominant or recessive alleles by crossing the true-breeding sepia hamsters to true-breeding black hamsters. From the resulting F1 progeny phenotype, what would be the ratio of F2 phenotype