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 Heredityhttp://www.brainpop.com/health/geneticsgrowthanddevelopment/heredity/
HEREDITYThe process in which characteristics pass from parents to offspring.
TRAITAn organism’s physical characteristics
Examples: eye color, hair color, height
DNADEOXYRIBONUCLEIC ACIDTHE GENETIC MATERIAL THAT
CARRIES INFORMATION ABOUT AN ORGANISM AND THAT IS PASSED FROM PARENT TO OFF SPRING.
http://www.brainpop.com/science/cellularlifeandgenetics/dna/
CHROMOSOMEA threadlike cellular structure that carries the information that controls inherited characteristics.
GENEGENEA SEGMENT OF DNA ON A CHROMOSOME THAT CODES FOR A SPECIFIC TRAIT.
ALLELESALLELESTHE DIFFERENT FORMS OF A GENE.
GENE SCAVENGER GENE SCAVENGER HUNTHUNTFind a person with the corresponding gene. Get their first and last initial.
The BIG Allele is
DOMINANT
It always shows upWe 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
http://www.brainpop.com/health/geneticsgrowthanddevelopment/genetics/
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?
AAAaaa
PHENOTYPEPHENOTYPEThe 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
AFRO
HOMOZYGOUS
SAMEAA, aa
HETEROZYGOUS
DIFFERENTAa
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
HOMOZYGOUS AA/ aa HOMOZYGOUS DOMINANT AA HOMOZYGOUS RECESSIVE aa HETEROZYGOUS Aa MUTATION 3
