Transcript AIM: How is the continuity of life sustained? (ILS LEKI#4)

AIM: How is the continuity of life
sustained? (ILS LEKI#4)
4/18/13
DO NOW:
1. Pick up your quiz and
finish it
HOMEWORK:
1. Read p. 45-47 in your
ILS Review Book
2. Answer Questions #131 on your scantron
DUE- Tomorrow Morning
by 8 AM
Base your answers to questions 1-3 on
the Punnett square below and on your
knowledge of science. The Punnett
square shows a cross between a mouse
with black fur whose genetic makeup
was BB, and a mouse with white fur
whose genetic makeup was bb.
1. Explain why all of the offspring
have black fur, even though each
of them has a gene for white fur.
2. A second cross was done using a
different pair of mice. One parent
was a mouse with white fur (bb).
The other parent was a mouse
with black fur. Some of the
offspring produced from this cross
had white fur. What genetic
makeup did this parent with black
fur have in order to produce some
offspring with white fur?
3. Create a punnett square using the
offspring from the first cross
What percentage of the offspring
were Black? White?
How does a species make sure that
the species continues to exist?
 Reproduction
How is asexual reproduction
different from sexual
reproduction?
 Asexual reproduction = 1 parent
 Sexual Reproduction = 2 parents
What are the types of asexual
reproduction?
 Binary Fission
 Spores
 Budding
 Mitosis
Fertilization
Explain how sexual reproduction occurs?
 The combining (fertilization) of the male sex cell (Sperm) and the
female sex cell (Egg)
How many chromosomes are contained in a human sex cell?
 23
How does fertilization produce a zygote with 46 chromosomes?
 23 from mom (egg)
 23 from dad (sperm)
What is a zygote?
 The new one-celled
offspring resulting from
fertilization.
How do we go from one
cell to billions of cells?
 Mitosis
How do plants
reproduce?
 Flowers
Identify the male and
female part of the
flower.
 Male = stamen
 Female = pistil
How does pollination
occur?
 Pollen Grain (male) falls
on the stigma (female).
 Sperm cells from the
pollen grain move thru
the pollen tube into the
ovary.
 The sperm fertilizes the
egg
What is a seed?
A seed the the fertilized zygote
of the plant.
Describe the structure of a
seed?
 Zygote (young plant)
 Stored food
 Seed coat
Why does the seed contain
stored food?
 The stored food provides
nourishment from
germination to seedling
when leaves are fully
developed
What is metamorphosis?
 A series of extreme changes
from young to adult
Describe the Life cycle of frog.
 Egg – tadpole – adult frog
Describe the Life cycle of a
beetle.
 Egg – larva – pupa – adult
beetle
The hydra shown below is reproducing asexually.
What percentage of the offspring’s genetic information is
the same as the genetic information of the parent?
Frogs live most of their lives in and around water. During the tadpole
stage, they live entirely underwater and get oxygen through their gills.
As adults, frogs can live on land and breathe air.
1. Identify one structural change to this organism’s body that occurs
during its life cycle.
2. An environmental change causes a decrease in the amount of
oxygen that is dissolved in the pond water. Explain why this change
would have a greater effect on the frog during the tadpole stage
than during the adult stage.