What is a chromosome?

1
What is a chromosome?
2
How many chromosomes are there in a human cell?
3
Chromosomes Occur in Pairs!!
4
(No Transcript)
5
Homologous Chromosomes
6
Haploid vs. Diploid

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

7
How are gametes formed?

• Meiosis

8
Meiosis
9
(No Transcript)
10
Fertilization
11
Intro to Genetics
Gene Allele Dominant A Recessive - a Homozygous
- AA Heterozygous Aa Genotype Phenotype
12
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.