Average October temperature in Las Vegas, Nevada. According to the National Weather Service, the normal average temperature in Las Vegas in October is 69.5 degrees. This marks a big drop off from the weather in Las Vegas in September, when the normal average temperature is nearly 83 degrees, and the average daily high is 94 degrees.
This fissure or âcrackâ is called the cleavage furrow. The furrow deepens as the actin ring contracts; eventually the membrane is cleaved in two. Cytokinesis: During cytokinesis in animal cells, a ring of actin filaments forms at the metaphase plate.
Mammals at this stage form a structure called the blastocyst, characterized by an inner cell mass that is distinct from the surrounding blastula, shown in b. During cleavage, the cells divide without an increase in mass; that is, one large single-celled zygote divides into multiple smaller cells. Each cell within the blastula is called a blastomere. (a) During cleavage, the zygote rapidly divides into multiple cells without increasing in size.