The results of Meiosis I are two diploid cells with genetic differences on the chromosome. These differences are a result of crossing-over. Crossing-over is a process that happens after both homologous chromosomes in a pair join up to form a structure called a tetrad. Tetrads form through a process called synapsis.
A tide is the periodic rising and falling of Earth's ocean surface caused mainly by the gravitational pull of the Moon acting on the oceans. Tides cause changes in the depth of marine and estuarine (river mouth) waters. Tides also make oscillating currents known as tidal streams (~'rip tides'). This means that being able to predict the tide is important for coastal navigation.
There are several effects that modify the lunar powered tides. 1  The moon's distance from the Earth varies because it is not in a perfectly circular orbit. 2  The shape of the coastline, inlets and blocking land masses or deep ocean basins all change the speed and max/min heights of the tides for any given location.