Quiz 4 Flashcards
What stage do chromosomes condense and become visible?
Prophase.
What stage does the centromere break and sister chromatids separate?
Anaphase.
What stage does the nucleolus reappear?
Telophase.
What stage do spindle fibres connect to centromeres?
Prophase.
When does cytokinesis occur?
Telophase.
When do chromosomes line up at centre plate?
Metaphase.
When does the nucleus break down?
Prophase.
When do centrosomes migrate to either pole?
Prophase.
When do chromosomes unwind and are no longer visible?
Telophase.
When is the contractile ring active?
Telophase.
What meiotic stage does crossing over occur?
Prophase 1.
What meiotic stage do homologous chromosomes separate from each other?
Anaphase 1.
What meiotic stage does independent assortment occur?
Anaphase 1.
What stage do sister chromatids separate and go to opposite cells?
Anaphase 2.
Is a cell at the start of meiosis haploid or diploid?
2N
Is a cell at the end of mitosis haploid or diploid?
2N.
Is a cell at the end of meiosis 1 haploid or diploid?
N.
Is a cell at the end of meiosis 2 haploid or diploid?
N.
Is a zygote haploid or diploid?
2N.
Is an egg haploid or diploid?
N.
What process of meiosis beings at puberty and then goes on through life?
Spermatogenesis.
What is the first meiotic division that actually occurs when an individual is an infant?
Oogenesis.
What meiotic stage do polar bodies occur?
Oogenesis.
Given a cell that has 10 chromosomes, how many chromatids will there be at the start of mitosis?
20.
Given a cell that has 10 chromosomes, how many chromatids will there be there at the end of mitosis?
20.
Given a cell that has 10 chromosomes, how many chromatids will there be at the start of meiosis?
20.
Given a cell that has 10 chromosomes, how many chromatids will there be for each cell at the end of meiosis 1?
10.
Given a cell that has 10 chromosomes, how many chromatids will there be for each cell at the end of meiosis 2?
5.
Define centromere.
Holds sister chromatids together.
Define chromatin.
What chromosomes are composed of in loose and unwound stage.
Briefly describe crossing over.
Homologous chromosomes share DNA with each other, resulting: sister chromatids will no longer be identical.
Briefly describe independent assortment.
Cant predict what pole chromatids will go to, happens during anaphase. Homologous chromosomes will separate from each other.
Outline the process of spermatogenesis.
Occurs in the testes of males. Produces sperm. Primary spermatocyte undergoes meiosis 1, turns into 2 secondary spermatocytes. Meiosis 2 occurs and 4 spermatids result which then mature into sperm.
