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^a and c^k. Each supplies a different amount of black pigment to the coat hair. The phenotypes of three different homozygous strains are as follows.

would mate the true-breeding  c^a c^a  hamsters to the true-breeding c^k c^k  hamsters to produce heterozygous  c^a and c^k  F1 progeny. Crosses and their interpretation that would have allowed geneticists to come to the conclusion that c^a and c^k were likely to be alleles of the same using the concept that alleles of the same gene will be tightly linked. What will be the ratio of F2 hamster;

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#Question id: 1354

#Unit 4. Cell Communication and Cell Signaling

Calcium-dependent adhesion is to the cadherins as calcium-independent adhesion is to the    ?    .

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#Question id: 1355

#Unit 4. Cell Communication and Cell Signaling

To which category of proteins listed below are NCAM and VCAM most closely related?

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#Question id: 1356

#Unit 4. Cell Communication and Cell Signaling

Which of the following cell types might have the highest number of desmosomes?

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#Question id: 1357

#Unit 4. Cell Communication and Cell Signaling

How might anti-selectin antibodies act as anti-inflammatory drugs?

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#Question id: 1358

#Unit 4. Cell Communication and Cell Signaling

In going from the apical to the basal end of an epithelial cell, in what order do the various cell surface junctions appear?

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#Question id: 1359

#Unit 4. Cell Communication and Cell Signaling

Cells of the heart must contract in synchrony to produce an effective heart beat. The electrical signal telling each cell to contract must reach every cell of the heart at the same time. What kind of cell-to-cell junctions would you expect to find in heart tissue?