#Question id: 5327
#Unit 8. Inheritance Biology
In the human pedigree shown here, the daughter indicated by the black circle (II-1) has a form of deafness determined by a recessive allele. What is the probability that the phenotypically normal son (II 3) is heterozygous for the gene?
#Question id: 12571
#Unit 10. Ecological Principles
#Question id: 5208
#Unit 11. Evolution and Behavior
Fragments of DNA have been extracted from the remnants of extinct wooly mammoths, amplified, and sequenced. These can now be used to
#Question id: 2996
#Unit 2. Cellular Organization
Cell death approximately equal to cell division is found in
#Question id: 9617
#Unit 9. Diversity of Life Forms
The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed 3-chambered hearts (2 atria, 1 ventricle). Birds and mammals, however, are alike in having 4-chambered hearts (2 atria, 2 ventricles). The 4-chambered hearts of birds and mammals are best described as