AIM: How is the continuity of life sustained? (ILS LEKI#4)
4/18/13DO NOW:1. Pick up your quiz and
finish it
HOMEWORK:1. Read p. 45-47 in your
ILS Review Book2. Answer Questions #1-
31 on your scantronDUE- 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
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? 23How does fertilization produce a zygote with 46 chromosomes? 23 from mom (egg) 23 from dad (sperm)
Fertilization
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 = stamenFemale = 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.
