If Earth’s plates are constantly moving, why don’t we need to update the locations of continents on world maps (such as the one above) all the time?

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

hope this : )

not: both offer magnification to the atomic level.