Syntenic Blocks Are Sections of Chromosomes That Have Remained Largely

Multiple Choice

Syntenic blocks are sections of chromosomes that have remained largely intact during evolution. For example, human chromosome 4 corresponds to syntenic blocks on mouse chromosomes 3, 5, and 8. Which of the following statements about synteny are true? Please select all that apply.

A) No crossovers occur in syntenic blocks
B) The ancestor of humans and mouse probably had similar syntenic blocks to those currently seen in mouse and human
C) X chromosomes are largely syntenic between placental mammals
D) The ancestor of humans and mouse had syntenic blocks as in human and these were rearranged to make different chromosomes in mouse