Which type of chromosome alteration results in the formation of a tetravalent (cross-like) structure at synapsis?

What was darwins theory of common decent

Iwill make you brainliest pleeze answer this fast i have to turn it in really soon brainliest promise easy question 6th grade ! a weather map shows a high pressure system with circles around it. what does this mean? a) an occluded front b) areas of equal altitude c) areas of equal pressure d) a stationary front

If an organ has six haploid chromosomes, how many chromosomes are present. 6 12