Notes for 9/21&24/07
Inherited Traits
1) You have 46 chromosomes in the nucleus of your cells.
2) You received 23 chromosomes from your mother and 23 from your father.
3) Your chromosomes are also called your genes.
4) Your chromosomes control many of your inherited traits.
5) Your inherited traits are your hair color, eye color, skin color, nose and ear shape, tongue rolling and more.
6) All of us have dominant traits we can see and recessive traits we can’t see.
7) Punit Squares-
Source Harcourt Science, 2000, A52-A53
Notes for 9/26/07
Punnet Squares
If a pure brown haired man married a hybrid brown/blonde haired girl what would be the color of their children’s hair?
Step 1) Figure out dominant and recessive.
Step 2) List all possible combinations of genes.
Step 3) Draw Punnet Square
Step 4) Use information from Punnet Square to answer the question.
Punnet Squares 2
If a pure brown haired girl married a blonde haired man what would be the color of their children’s hair?
Step 1) Figure out dominant and recessive.
Step 2) List all possible combinations of genes.
Step 3) Draw Punnet Square
Step 4) Use information from Punnet Square to answer the question.
Punnet Squares 3
If a hybrid brown eyed man married a blue-eyed girl how many children would have brown eyes?
Step 1) Figure out dominant and recessive.
Step 2) List all possible combinations of genes.
Step 3) Draw Punnet Square
Step 4) Use information from Punnet Square to answer the question.
Punnet Squares 4
Punnet Squares will give you information that will predict the probability of something happening.
Probability is stated from 0 to 1.
0/4 of the squares means 0 probability of something happening or 0% chance of it happening.
1/4 of the squares means .25 probability of something happening or 25% chance of it happening.
2/4 of the squares means .50 probability of something happening or 50% chance of it happening.
3/4 of the squares means .75 probability of something happening or 75% chance of it happening.
4/4 of the squares means 1.00 probability of something happening or 100% chance of it happening.
Notes for 9/28/07-10/1/07
Plant Anatomy
There are a half a million different types of plants on Earth.
Most plants have 3 parts in common: roots, stems, and leaves.
Roots: Anchor the plant into the ground
Take in water and minerals from the soil
Some roots store food for plant
Prop roots – begin above ground and spread out – big trees
Fibrous roots- brushy, bushy- help prevent soil erosion – grass
Tap roots – single, large, long root deep in ground; store food and water for winter - trees
Stems: Hold plant straight up for sunlight
Carry food and water to other parts of plant
Xylem – water and minerals up from roots to rest of plant
Phloem- food from leaves down to rest of plant- tree bark is old phloem
Leaves: Food factories – photosynthesis- have chlorophyll in the chloroplasts – take in CO2 and release O2
Source: Harcourt Science, 2000, A66-A71
Notes for 10/2/07
Types of Plants and Uses of Plants
Most plants have roots, stems, and leaves.
Many plants have xylem and phloem.
Xylem carries the water and minerals up from the roots.
Phloem carries the food down from the leaves.
Xylem and phloem are called vascular tissue.
Some small plants do not have vascular tissue.
These plants can move minerals, food, and water only from one cell to the next. That is why they are so small.
Nonvascular plants do not reproduce with seeds. They use spores to reproduce instead.
Many plants reproduce using pollen. The pollen moves from one plant to another by wind or animals.
Compare life cycles of plants and animals:
We use plants for food. They also provide us with oxygen.
We also use plants for medicine and clothing.
Source: Harcourt Science, 2000, A74-A85