What is a chromosome?.

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Presentation transcript:

What is a chromosome?

How many chromosomes are there in a human cell?

Chromosomes Occur in Pairs!!

Homologous Chromosomes

Haploid vs. Diploid Haploid = 1n Diploid = 2n 1 set of chromosomes Gametes Egg Sperm Diploid = 2n 2 sets of chromosomes 1 set from father, 1 set from mother

How are gametes formed? Meiosis

Meiosis

Fertilization

Intro to Genetics Gene Allele Dominant – A Recessive - a Homozygous - AA Heterozygous – Aa Genotype Phenotype

Steps for Solving Genetics Problems Determine the genotype for each parent. Determine the different gametes that each parent can make for the trait in question. Draw a Punnett square with the possible gametes for one parent across the top and the gametes for the other parent down the side. Show the genotype of each of the offspring that would be produced by the joining of the gametes. Determine the phenotypes for each offspring. Calculate percentages or probabilities.