Presentation on theme: "1 Review Write a summary of each phase of meiosis Use Analogies Compare the chromosomes of a diploid cell to a collection of shoes in a closet. How are."— Presentation transcript:
1 Review Write a summary of each phase of meiosis Use Analogies Compare the chromosomes of a diploid cell to a collection of shoes in a closet. How are they similar. What would make the shoe collection comparable to the chromosomes of a haploid cell 2 Review What are the principle differences between mitosis and meiosis 3 Review How does the principle of independent assortment apply to chromosomes Infer If two genes are on the same chromosome but usually assort independently, what does that tell you about how close together they are
Chromosomes Each chromosome consists of two copies ensuring that each new cell will have the same genetic information The identical strands of DNA are each called chromatids and are held together by a centromere.
Gene Linkage The closer two genes are located on a chromosome the more likely those alleles will occur together Less of a chance for crossing over to occur in between Used to map out location of genes.
Haploid and diploid numbers are designated N and 2N. The table shows haploid or diploid numbers of a variety of organisms. Copy the table and complete it and then use it to answer the questions on the next slide.
1. Calculate What are the haploid numbers for the fern and onion plants 2. Interpret Data In the table, which organisms diploid number is closest to a human 3. Apply Concepts Why is a diploid number always even 4. Evaluate Which organism’s haploid and diploid numbers do you find most surprising- why