biology

The diagram below shows homologous chromosomes during prophase I of meiosis. Which of the following correctly describes the process being illustrated?

crossing-over in which alleles (genes) are exchanged

If an organism's diploid number is 12 chromosomes, what is its' haploid number?

6

Why is there not an Interphase between Meiosis I and Meiosis II?

Because you do not want to copy the genetic material again.

Which of the following (select all that apply) contribute to genetic diversity (shuffling the genes during meiosis)?

Crossing Over, Random Sperm fertilizing egg, Independent Assortment

The random lining up of homologous chromosomes during Metaphase 1--(see picture) is called.

Independent Assortment

The main difference between meiosis and mitosis is that

Mitosis makes genetically identical copies; meiosis makes genetically unique cells.

At which stage of meiosis do sister chromatids separate and become chromosomes?

anaphase II

Which set of characteristics describes cells undergoing Prophase 1?

diploid; crossing over occurs

Genetic diseases can arise because a mom donates two many chromosomes in her egg or a dad donates too many chromosomes in his sperm. Which disease we have discussed results from three 21st chromosomes?

down syndrome

Four of the five answers listed below concern cells with two copies of each chromosome. Select which cell does NOT CONTAIN TWO COPIES OF EACH CHROMOSOME.

gametes

Meiosis 1 separates ______ while Meiosis 2 separates _______.

homologous chromosomes ; sister chromatids

Metaphase of meiosis I and meiosis II differ in that...

homologous chromosomes line up in meiosis I & X shaped chromosomes line up single file in meiosis II

Homologous chromosomes move towards opposite sides of a dividing cell during.... (so the X's move away from each other)

meiosis 1

Four of the five answers listed below are characteristic of meiosis. Select the exception (pick which answer is NOT TRUE!!)

produces 2 genetically identical cells

Homologous chromosomes pair up (the 1M finds the 1P) during this phase of Meiosis--another hint: Crossing over occurs.

prophase 1

Meiosis II is similar to mitosis in that...

sister chromatids separate during anaphase

The purpose of Mitosis is to make ______ cells while the purpose of meiosis is to make ________.

somatic; gametes

Meiosis occurs in the______ in males and in________ in females.

testes, ovaries

Which 2 cells would be more genetically similar to each other?

two somatic cells produced by the same person