Start-up for 12/8/14 Complete the word search regarding meiosis terminology. If you are the first person finished, let me know.

Sexual Cell Reproduction Ch. 11 Section 4 Page 275-278 Meiosis & Genetics Sexual Cell Reproduction Ch. 11 Section 4 Page 275-278

Objectives: Students will Identify our genetic material and its location. Summarize the relationship between DNA, alleles, genes, chromosomes, and traits. Identify the locations of meiosis Summarize why half of an individual's genetic information comes from each parent Determine an individual's sex based on their chromosome makeup.

Chromosomes DNA X Code for traits Nucleus Identify our genetic material and its location. Chromosomes DNA Code for traits X Nucleus

All of these determine traits. Obj. B) Summarize the relationship between DNA, alleles, genes, chromosomes, and traits. All of these determine traits. Hair Color X B b DNA Chromosome Allele Gene = smallest unit Eye Color g g

What is this? DNA Gene Segment For Hair color 2 Alleles Gene Obj. B) Summarize the relationship between DNA, alleles, genes, chromosomes, and traits. What is this? DNA 2 Alleles Gene Chromosome Gene Segment For Hair color

Trait Characteristic Feature Variations in a population Obj. B) Summarize the relationship between DNA, alleles, genes, chromosomes, and traits. Trait Characteristic Feature Variations in a population Can you ID some traits on this man?

Meiosis in the Gonads Sperm Egg Meiotic cell division Testis Ovary Obj. C) Identify the locations of meiosis Meiosis in the Gonads Testis Ovary Sperm Meiotic cell division Egg

MEIOSIS GG PERM Gonads make gametes! In males TESTES make sperm Obj. C) Where does meiosis occur? Gonads make gametes! MEIOSIS GG PERM In males TESTES make sperm

Gonads make gametes! In females OVARIES make eggs Obj. C) Where does meiosis occur? Gonads make gametes! In females OVARIES make eggs

Chromosome Number Homologous Chromosomes are the sets of each pair Obj D) Summarize why half of an individual's genetic information comes from each parent Chromosome Number If a lizard’s diploid # is 36, what is its haploid #? Different # for different species Full set = 2N=Diploid N = Haploid # pairs 1 pair from mother 1 pair from father Humans= 23 homologous chromosomes (pairs) or 46 total Homologous Chromosomes are the sets of each pair 18 Why are total chromosome numbers always even? They come in pairs

Autosomes & Sex Chromosomes Obj. E) Determine an individual's sex based on their chromosome makeup. Autosomes & Sex Chromosomes Autosomes = # 1-22 for all traits except sex Sex chromosomes= Pair # 23 XX(female) or XY(male)

Obj. E) Determine an individual's sex based on their chromosome makeup. Male or Female? Male

What is the problem? Down Syndrome= 3 of #21 Male or Female? Obj. E) Determine an individual's sex based on their chromosome makeup. What is the problem? Down Syndrome= 3 of #21 Male or Female?

Understanding Check Complete the following and finish CH 11-4 Link words. Place these in order from smallest to largest: gene, allele, DNA, chromosome. Where does meiosis occur in males and females? What are homologous chromosomes? How many do humans have? What is the genetic make-up of a female? Why is the chromosome number usually even?