TVMSC Biology, chapter 8 review, part 2

Most of the cell cycle is taken up by

• prophase

• metaphase

• interphase

• mitosis

DNA replication occurs during

• interphase

• mitosis

• prophase

• metaphase

The two copies you have of chromosome no. 6 are called

• alleles

• just chromosome number 6

• homologous pair members

a certain gene, say the gene for making keratin

• can occur on different chromosomes, like nunber 1 and number 12

• is found on the same chromosome, but can be in different positions

• is found on the same chromosome, in the same position

In a diploid organism, if there are 7 alleles of a particular gene in the population, what is the maximum number of different alleles an individual may possess?

• 1

• 2

• 3

• this is unpredictable without further information

The two copies of chromosome number 8 that you have

• could both have come from one of your parents

• you got one from mom, the other from dad

Meiosis involves

• one cell division

• two cell divisions

Abnormal chromosome numbers such as "trisomy 21" (3 copies of number 21) are caused by

• nondisjunction during meiosis

• any sort of mutation

"nondisjunction" means

• a part of a chromosomne gets flipped end-for-end

• sister chromatids fail to separate normally during meiosis I or meiosis II

For most chromosomes, receiving the wrong number (too few or too many) is normally

• catastrophic, i.e., non-survivable

• no big deal