Meiosis and Variation Guided Notes

Start with the guided notes, then use the stage matching sheet to check understanding. The graphing and crossing over sheets work as practice or review before a heredity unit.

Count chromosomes in each meiosis cell for 2n = 4, then fill in notes on crossing over and assortment. The directions on the page read: Read the text. Write the number of chromosomes in each cell in the box under it. An answer key is included.

Yes, both. We made it for 8th grade living things, and it works the same at home or at school. At home, a student can work through it alone and then go over it with you, which shows quickly what is solid and what needs another look. In class it works as independent practice, homework or a warm-up, and you can print one copy or a full set.

Mitosis makes two cells with the same number of chromosomes as the parent cell. Meiosis divides twice and makes four sex cells, each with half the chromosomes. Graph DNA Amount Through Mitosis and Meiosis shows the difference as steps on two graphs.

During meiosis I, paired chromosomes can break at the same point and swap matching pieces. This gives chromatids new mixes of alleles. Color Code Crossing Over in Meiosis has students fill in four chromatids and list the gametes.

Meiosis mixes genes in two ways. Crossing over swaps pieces between paired chromosomes, and independent assortment sends each partner to either side by chance. Meiosis and Variation Guided Notes explains both.