What proportion of alleles do identical twins have in common

Which class of molecules contains the amino group, nh2 (a) sugars (b) water (c) proteins (d) hydrocarbons

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?

Use the phylogenetic tree to the right to determine which statement below is true. organisms a and f are not related. organism e is more closely related to organism b than organism f. organisms c and d are more closely related than organisms a and b. phylogenetic trees