human egg cell mitochondrial DNA 90 percent

Most of an egg cell's DNA copies can be mitochondrial

Up To 90%

A human egg cell can contain up to 1.5 million copies of the small mitochondrial genome. Because there are so many copies, mitochondrial DNA can make up as much as 90% of all the separate DNA molecules in the cell.

Dry seasons helped create settled villages

After the last ice age, longer dry seasons in the Levant favored plants whose seeds could be stored. Hunter-gatherers began living in permanent villages, and people were planting wild crops before those plants became fully domesticated.

Tropical seasons often differ more in rainfall

In the tropics, the Sun stays relatively high in the sky throughout the year, so temperatures change little from season to season. Rainfall often changes more, making wet and dry seasons a clearer contrast than the familiar summer and winter temperature shifts.

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human egg cell mitochondrial DNA 90 percent

Most of an egg cell's DNA copies can be mitochondrial

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