#Question id: 11165
#Unit 2. Cellular Organization
Membrane lipids in tissue samples obtained from different parts of a reindeer’s leg have different fatty acid compositions. Membrane lipids from tissue near the hooves contain a larger proportion of unsaturated fatty acids than those from tissue in the upper leg. What is the significance of this observation?
#Question id: 4714
#Unit 11. Evolution and Behavior
After the drought of 1977, researchers hypothesized that on the Galápagos Island Daphne Major, medium ground finches with large, deep beaks survived better than those with smaller beaks because they could more easily crack and eat the tough Tribulus cistoides fruits. A tourist company sets up reliable feeding stations with a variety of bird seeds (different types and sizes) so that tourists can get a better look at the finches. Which of these events is now most likely to occur to finch beaks on this island?
#Question id: 15383
#Unit 8. Inheritance Biology
#Question id: 16316
#Unit 7. System Physiology – Animal
#Question id: 15194
#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, ca and ck. 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 ca ca hamsters to the true-breeding ck ck hamsters to produce heterozygous ca and ck F1 progeny, the F1 progeny cack hamsters self fertilized, From the fraction of F2 progeny that have the wild type black phenotype,
