Meiosis #1

Why do we need meiosis?

• To double the number of chromosomes going into sex cells
• To halve the number of chromosomes going into sex cells
• To triple the number of chromosomes going into sex cells
• To not change the number of chromosomes going into sex cells

In MITOSIS cells are genetically _______, but in MEIOSIS cells are genetically ______.

• diferent, identical

• identical, different

• different, different

• identical, identical

Structure (b) is pointing to a 

• chromatid
• chromosome
• centromere
• DNA

Structure (a) refers to the _____.

• sister chromosomes

• sister chromatids

• centromere

• centriole

When an area of a chromatid is exchanged with the matching area on a chromatid of its homologous chromosome, _________________ occurs.

• crossing over

• mutagenesis

• hybridization

• fertilization

According to the chromosome theory of inheritance, what are carried from parents to their offspring on chromosomes?

• Genes
• Spindle Fibers
• Centrioles
• Cytoplasm

Diploid cells are represented by....

• 2n

• n

• 4n

• ½n

Meiosis makes sperm and egg cells. In humans, sperm and egg cells each have _____ chromosomes. Therefore a fertilized human egg cell (sperm and egg cell combined) would create a cell with _____ chromosomes.

• 23, 46
• 46, 23
• 2, 4
• 50, 100

During which phase of meiosis does crossing over occur?

• Prophase I

• Metaphase I

• Prophase II

• Metaphase II

• During any stage of meiosis

During Metaphase I, how do the chromosomes line up on spindle?

• One homologous chromosome per spindle fiber

• Two homologous chromosomes per spindle fiber

• One random chromosome per spindle fiber

• Two random chromosomes per spindle fiber