Mitosis and Meiosis Review True or False Mitosis
- Slides: 71
Mitosis and Meiosis Review
True or False? • Mitosis is considered to be a form of asexual reproduction
True
True or False? • During cytokinesis in plant cells, the cell is pinched in half by a belt of protein threads.
• False; in plant cells a cell plate and cell wall forms between the two nuclei.
True or False? • Meiosis produces four cells that have different chromosome numbers from the parent cell.
• True
True or false? • Cells spend most of their lifetime in interphase.
• True
• How do bacteria reproduce?
• Binary fission (asexual reproduction)
• The point at which two chromatids are attached to each other in a chromosome is called a ______
• Centromere
• How many chromosomes are in the body cells of an organism that has a haploid number of 8?
• The failure of replicated chromosomes to separate is called __________.
• nondisjunction
A cell has a diploid number of 8. How many chromatids will it have in G 2? (a) 2 (b) 4 (c) 8 (d) 16 (e) 32 (f) None of these
A cell has a diploid number of 8. How many chromatids will it have in G 2? (a) 2 (b) 4 (c) 8 (d) 16 (e) 32 (f) None of these
A cell has a diploid number of 8. How many chromatids would a newly formed sperm cell have? (a) 2 (b) 4 (c) 8 (d) 16 (e) 32 (f) None of these
A cell has a diploid number of 8. How many chromatids a newly formed sperm cell have? (a) 2 (b) 4 (c) 8 (d) 16 (e) 32 (f) None of these
A cell has a diploid number of 8. How many homologous pairs of chromosomes? (a) 2 (b) 4 (c) 8 (d) 16 (e) 32 (f) None of these
A cell has a diploid number of 8. How many homologous pairs of chromosomes? (a) 2 (b) 4 (c) 8 (d) 16 (e) 32 (f) None of these
A cell has a diploid number of 8. How many telomeres in G 2? (a) 2 (b) 4 (c) 8 (d) 16 (e) 32 (f) None of these
A cell has a diploid number of 8. How many telomeres in G 2? (a) 2 (b) 4 (c) 8 (d) 16 (e) 32 (f) None of these
A cell has a diploid number of 8. How many chromosomes from the mother? (a) 2 (b) 4 (c) 8 (d) 16 (e) 32 (f) None of these
A cell has a diploid number of 8. How many chromosomes from the mother? (a) 2 (b) 4 (c) 8 (d) 16 (e) 32 (f) None of these
• A picture of a cell’s chromosomes is called a ____________
• Karyotype
The spreading of cancer is called ________
• Metastasis
Which of these is diploid? • • a) b) c) d) egg cell sperm cell zygote none of the above
• c) a zygote is diploid
Name the procedure used to produce a karyotype.
• Amniocentesis
A spindle fiber is a specialized form of a. microtubule. c. cilium. b. flagellum. d. chromosome.
• A. microtubule
When does nondisjunction occur? (during what phases)
Anaphase I or Anaphase II
True or False? During telophase, a nuclear envelope surrounds each new set of chromosomes
True
• A cell is in G 2, preparing to enter mitosis. • It has 12 pairs of chromosomes. • How many total chromatids are present?
48 • 12 pairs = 24 total chromosomes • each chromosome has 2 chromatids, so 48 chromatids
True or False? Crossing-over is the exchange of reciprocal segments of DNA between non-homologous chromosomes.
• False; between HOMOLOGOUS chromosomes
Diagrams A and B show cells from an organism with a diploid chromosome number of 4. Which will be diploid at the completion of division? a) A b) B c) both A and B d) neither A nor B
• A; it is going through mitosis
What is synthesized during the S phase of the cell cycle?
DNA, or an identical sister chromatid
When do centrioles move to the poles of a cell? • • A) B) C) D) prophase metaphase anaphase telophase
• A) prophase
What phase is being shown?
Anaphase
Cytokinesis is the division of ___
Cytoplasm
In which phase does the DNA condense into visible chromosomes?
prophase
What phase is being shown?
Metaphase I of Meiosis
These noncoding ends of chromosomes are called _______ Shown in yellow
Telomeres
Which cells divide the most quickly? • • a) b) c) d) red blood cell liver cell neurons skin cell
• Skin cells
Another name for body cells is _____ cells. They are always haploid/diploid. (choose one)
• somatic, diploid
• The process by which a zygote is formed is called_______
Fertilization
What is the name for the process that produces egg cells? • (more specific than meiosis)
Oogenesis
Final question: • • • Name the disorders that we discussed that were examples of: A) monosomy B) trisomy
A) Turner syndrome is monosomy X • B) Down syndrome is trisomy 21 •