Crossing over crossing over plays a critical role in increasing the genetic variation among offspring of sexual reproduction. it is important to understand how crossing over occurs and its consequences in meiosis. look carefully at the diagrams depicting different stages in meiosis in a cell where 2n = 6. assume that the red chromosomes are of maternal origin and the blue chromosomes are of paternal origin.

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Which describes how weathering and erosion are different? weathering is caused by water. erosion is caused by wind and ice. erosion transports sediments. weathering is a natural process.

In a classic experiment using pea shape, mendel conducted two separate genetic crosses. in the first cross the parent plants were “true breeding” for pea shape; one had round peas ( r )and the other had wrinkled (r). the first cross produced a filial 1 generation of all round peas. in the second cross, mendel bred plants from the filial 1 generation. this cross produced different results. out of approximately 1000 plants, about 75% were round and 25% were wrinkled.