Get out ISN we are taking notes. Topic No. 23 Genetics Content Obj. You will demonstrate comprehension of Genetics by watching a brainpop video and correctly answering the questions that follow. Language Obj. You will describe and explain how traits are passed using words homozygous, heterozygous, DNA and gene.

GENETICS The Study of Heredity csgrowthanddevelopment/heredity/

HEREDITY  The process in which characteristics pass from parents to offspring.

TRAIT  An organism’s physical characteristics Examples: eye color, hair color, height

DNA  DEOXYRIBONUCLEIC ACID  THE GENETIC MATERIAL THAT CARRIES INFORMATION ABOUT AN ORGANISM AND THAT IS PASSED FROM PARENT TO OFF SPRING. 

CHROMOSOME  A threadlike cellular structure that carries the information that controls inherited characteristics.

GENE  A SEGMENT OF DNA ON A CHROMOSOME THAT CODES FOR A SPECIFIC TRAIT.

ALLELES  THE DIFFERENT FORMS OF A GENE.

GENE SCAVENGER HUNT  Find a person with the corresponding gene. Get their first and last initial.

The BIG Allele is DOMINANT It always shows up We write it with a CAPITAL LETTER

The small Allele is RECESSIVE It is always hidden when a dominant is present. It will only show up if there are two recessive alleles We write it with a lower case letter

Each genotype has 2 alleles ONE FROM MOM ONE FROM DAD Aa GENOTYPE- GENETIC MAKE-UP (COMBINATION OF LETTERS)

HOW DO WE KNOW WHAT LETTER TO USE Use the FIRST letter of the DOMINANT Gene

What are the combination of alleles? AA Aa aa

PHENOTYPE  The physical appearance of a trait (the trait you can see) Example: eye color, skin color, hair color

PHENOTYPE is the physical description. AA Aa aa What will be the phenotype for the following genotypes? NO AFRO AFRO

HOMOZYGOUS SAME AA, aa

HETEROZYGOUS DIFFERENT Aa

Freckles is Dominant to Non freckles  ____ Freckles ____ No freckles  _______ Homozygous Dominant  _______ Heterozygous  _______ Homozygous Recessive

Brown hair is Dominant to Red Hair  ____ Brown_____ Red  _______ Homozygous Dominant  _______ Heterozygous  _______ Homozygous Recessive

 HOMOZYGOUSAA/ aa  HOMOZYGOUS DOMINANTAA  HOMOZYGOUS RECESSIVEaa  HETEROZYGOUSAa  MUTATION3