Exam 2: Mitosis and Meiosis

In a healthy male,how many sperm cells would be expected to be formed from (a)400 primary spermatocytes? (b)400 secondary spermatocytes?

When cells withdraw from the continuous cell cycle and enter a "quiescent" phase,they are said to be in what stage?

If a typical G1 nucleus is 2n and contains 2C (two complements)of DNA,a prophase I cell is 2n and contains 4C of DNA.

During interphase of the cell cycle,________.

Down syndrome,or trisomy 21,in humans is caused by an extra copy of the relatively small,acrocentric chromosome #21.Including only chromosome #21,the X chromosome (medium in size and somewhat metacentric),and the Y chromosome (small and acrocentric),draw one possible array of chromosomes in the four sperm cells produced by the complete meiosis of one primary spermatocyte.For the purposes of this question,assume that males with Down syndrome produce normal ratios of sperm cells.(More than one answer is possible.)

The diploid chromosome number of an organism is usually represented as 2n.Humans have a diploid chromosome number of 46.What would be the expected haploid chromosome number in a human?

A chromosome may contain one or two chromatids in different phases of the mitotic or meiotic cell cycle.

There is about as much nuclear DNA in a primary spermatocyte as in ________ [number] spermatids?

What hypothesis concerns the evolutionary origin of eukaryotic organelles?

How many haploid sets of chromosomes are present in a diploid individual cell with a chromosome number of 46? 32?

In which stage of the cell cycle is G0 located?