1. Warm up
Pre- Test

2. Traits What are some traits you inherited?
How do you think these traits were passed to you?

3. Instructions for traits are on Chromosomes
Contains DNA Genes
Functional unit that controls the expression of an inherited trait
Found in the Nucleus

5. Consist of DNA associated with proteins.
Chapter 11
Complex Inheritance and Human Heredity
Telomeres
Consist of DNA associated with proteins.
Ends of Chromosomes
Protective function for the structure of the chromosome

6. Sister Chromatids C H R O M A T I D
Centromere
Telomere

7. Homologous Chromosomes
Carry genes that control the same traits
Same centromere position
Same length

8. XX = Girl XY= Boy Humans Am I a Boy or Girl? 46 Chromosomes
23 Pairs of Chromosomes
XX = Girl XY= Boy

9. How many chromosomes does each parent contribute?23

10. Gametes
Sex cells
How many chromosomes?

11. Haploid and Diploid Haploid- Half set of chromosomes
Diploid- Full set of chromosomes.

12. Diploid n chromosomes n chromosomes from female 2 n chromosomes
n = # of chromosomes
haploid- n # of chromosomes
diploid- 2n # of chromosomes
Gametes combine= Fertilization
n chromosomes
from female
n chromosomes
from male
2 n chromosomes
Diploid

14. Recap How did you inherit genes from your parents? Both or one?
How many chromosomes from each parent?
Haploid vs. Diploid?
Which are gametes?

15. Meiosis Gametes are formed Reduces the number of chromosomes....Why?
Provides genetic variation
Reduces the number of chromosomes....Why?
2n -> 1n

16. Two Divisions Meiosis I and Meiosis II
Interphase
Prophase I
Prophase II
Metaphase I
Metaphase II
Anaphase I
Anaphase II
Telophase I
Telophase II

17. Meiosis I
Interphase
Growth
Chromosome duplication

18. Meiosis I Prophase I Chromosomes become visible
Crossing Over- Homologous
Chromosomes exchange
segments
What’s occurring in this picture?

19. Meiosis I Metaphase I Homologous pairs line up
Chromosome centromeres attach to spindle fibers.

20. Meiosis I
Anaphase I
Homologous chromsomes separate and move to opposite poles

21. Meiosis I Telophase I Homologous Chromosomes reach opposite poles.
Cytokinesis takes place
Two new cells are formed
Each new cell has ½ the original genetic information

22. Meiosis II Prophase II Metaphase II Spindle Apparatus forms
Chromosomes condense
Metaphase II
Haploid Chromosomes
line up

23. Meiosis II Anaphase II Telophase II
Sister chromatids are pulled apart and move toward opposite poles
Telophase II
Chromosomes reach poles
Nuclear membrane and nuclei reform
Cytokinesis
4 haploid cells with n chromosomes

25. Mitosis/ Meiosis Activity
Work with a partner.
Answer Questions
Determine which cards are mitosis and which are meiosis
Put the cards for each process in order

26. Quiz Infer why gametes are haploid?
Analyze how traits are passed from one generation to the next.