The reason that paralogous genes can diverge from each other within the same gene pool, whereas orthologous genes diverge only after gene pools are isolated from each other, is that

#Question id: 9617

#XL - S Microbiology

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

#Question id: 9617

#XL - R Botany

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

#Question id: 9618

#XL - S Microbiology

Generally, within a lineage, the largest number of shared derived characters should be found among two organisms that are members of the same

#Question id: 9618

#XL - R Botany

Generally, within a lineage, the largest number of shared derived characters should be found among two organisms that are members of the same

#Question id: 9619

#XL - S Microbiology

A common ancestor for both species C and E could be at position number 

#Question id: 9619

#XL - R Botany

A common ancestor for both species C and E could be at position number