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

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#Question id: 32274

#Unit 2. Cellular Organization

Which of the following function is not related to smooth endoplasmic reticulum?

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#Question id: 27026

#Unit 10. Ecological Principles

Toxic substances that are effective such as Cyanogenic compounds (Atropine) are the example of

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#Question id: 13187

#Unit 10. Ecological Principles

The following figure is a model of seedling establishment as a function of distance from a parent tree. Initial seed density measures the number of seeds falling to the ground. Seed survivorship measures the proportion of seeds that survive to the adult stage at each distance

Which of the following factors is most likely to generate the seed density curve shown? 

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#Question id: 5020

#Unit 11. Evolution and Behavior

Dicynodonts survived the Permian extinction and, therefore, existed during both the

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#Question id: 11951

#Unit 7. System Physiology – Animal

Very early in embryonic development, testosterone is formed within the male embryo. What is the function of this hormone at this stage of development?