Days 3 & 4 HEREDITY Observe the pictures that follow: JOHN and SEAN .
Post on 18-Dec-2015
214 Views
Preview:
Transcript
Days 3 & 4 HEREDITY
Observe the pictures that follow:
JOHN and SEAN
http://www.foxnews.com/images/256459/0_64_lennon_john06.jpg
Observe…
PAUL and JAMES
http://images.huffingtonpost.com/gen/3068/thumbs/s-JAMES-MCCARTNEY-large.jpg
MARTIN and Emilio
http://www.davidstuff.com/opinion/dem-sheen.jpg
Observe…
GABBY and KC
http://shannen143.files.wordpress.com/2010/01/012410-gabbykc.jpg
Observe…
RESEMBLING OUR PARENTS
Heredity - passing on of traits from one
generation to the next.
• It is the reason why offspring look like their
parents. • It also explains why cats always give birth
to kittens and never puppies. • It occurs among all living things.• Genetics – study of heredity• Geneticist – scientist who study heredity _
• We inherit from our parents some physical features that are easily visible.
• Some characteristics UNIQUE to us:
- fingerprints
- voice
- patterns in the iris of our eyes
* These characteristics can be used to
identify people.
RESEMBLING OUR PARENTS
Other inherited characteristics:- hair texture - eye color - skin color - height
Other characteristic not easily seen:- blood type- genetic diseases such as cancer, diabetes, food allergies
INHERITED CHARACTERISTICS
IN ANIMALS:• skin color and fur
type• behavioral
characteristic such as instinct (feeding, nest building and mating)
http://www.hindu.com/2007/01/19/images/2007011902830201.jpg
INHERITED CHARACTERISTICS
IN PLANTS:• color of fruits and flowers• shape of fruits and flowers• size of fruits and flowers • taste of the fruits• presence of seeds in the
flowers• behavioral characteristic such
as plant growth in the presence of light
INHERITED CHARACTERISTICS
NON-INHERITED CHARACTERISTICS
• also called acquired traits• developed as a result of interaction with the
environment• developed to be able to adapt to the
environment• Examples are: - politeness - certain likes and dislikes - changes in skin color (tanned skin) - changes in height (exercise and body supplement)
FROM PARENTS TO YOUNG
• Genetic information of both parents is passed on to the young during sexual reproduction.
• It carries the characteristics that we inherit from our parents.
• This results to offspring that resembles both parents but
is not identical to either parent.
Chromosomes
- contain the genetic information of a person
- thread-like protein structures found in the nucleus of every cell in the body
FROM PARENTS TO YOUNG
Each body cell
• Contains 23 corresponding pairs of chromosomes, with exception of sex cells
Sex cells (sperm and egg)
• Contain 23 chromosomes each
• During fertilization, each of the 23 chromosomes in the egg and sperm joins its corresponding chromosome to form 23 pairs. Hence, the genetic information of both parents are mixed.
FROM PARENTS TO YOUNG
FAMILY TREE
• shows the links between parents, offspring, siblings and spouses in a family
• shows only the members of the same family
Creating a family tree
• male is noted by a square and female by a circle. A family is shown by a horizontal line connecting the two.
Family tree . . .
• Children are placed below the family line from the oldest to the youngest, left to right.
• Deaths are represented with an "X" or a slash through the symbol itself.
• Represent offspring from marriage relationships with a vertical line, descending from the marriage line and arcing out to all the children.
• Twins can be represented with an inverted "V," descending from the offspring line.
Family tree . . .
Uses of family trees
• to know the number of members in the family
• to know the number of individuals of each gender
• to know the relationships between members _
Family tree . . .
HW: Bring the following next meeting: - 1 short bond paper - coloring materials (crayons, colored pencils or pens) - pencil - rulerEnd
Sources:
http://www.cccoe.net/genetics/heredity.htmlhttp://learn.genetics.utah.edu/content/begin/traits/http://www.genopro.com/genogram/rules/http://www.ehow.com/how_4474634_make-family-tree-diagram.html
top related