1. What is the state of the DNA at the end of meiosis I? What about at the end o
ID: 48726 • Letter: 1
Question
1. What is the state of the DNA at the end of meiosis I? What about at the end of meiosis II?
2. Why are chromosomes important?
3. How are Meiosis I and Meiosis II different?
4. Name two ways meiosis contributes to genetic recombination.
5. Why do you use non?sister chromatids to demonstrate crossing over?
6. How many chromosomes were present when meiosis I started?
7. Why is it necessary to reduce the chromosome number of gametes, but not other cells of an organism?
8. If humans have 46 chromosomes in each of their body cells, determine how many chromosomes you would expect to find in the following:
Sperm ___________________
Egg ___________________
Daughter cell from mitosis ___________________
Daughter cell from Meiosis II ___________________
9. Investigate a disease that is caused by chromosomal mutations. When does the mutation occur? What chromosome is affected? What are the consequences?
Explanation / Answer
1. DNA (genetic material) divides into two daughter cells that contains haploid number of chromosomes at the end of meiosis I and divides into four daughter cells at the end of meiosis -II. In both the cases, the daughter cells carry 23 chromosomes (haplod) and these are not identical to parent cells.
2. Chromosomes carry the gentic material from parent cells to the daughter cells. They are the media of genetic transport.
3. In meiosis I, the homologous chromosomes separate and and each chromosome contains two chromatids (reduction division). After a short interphase the cells enter into meiosis II. In meiosis II, the chromatids of each chromosome separate at the centromere and deveop into another two daughter cells carryong haploid number of chrmosomes.
4. Two two ways in meiosis that contribute to genetic recombination are, crossing over and independent assortment.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.