Naila :]

Naila :]

Monday, February 4, 2013

4th 6 weeks CBA Review part 1

1.  Explain how the different types of reproduction produce uniform or diverse offspring and give examples of each.
Uniform Offspring: By asexual reproduction
Examples: Strawberry plants, kiwis, apples, bananas, cotton.

Diverse Offspring: By sexual reproduction.
Examples: Human, dolphins, whales, pigs, puppies.

2. Explain heredity.
Heredity is the passing on of physical or mental characteristics genetically from one generation to another.

3. Understand that traits are inherited from prior generations and give examples and non-examples.
    Examples of inherited traits: 
Brown or black hair, blue or hazel eyes, short or tall, bushy or non-bushy eyebrows. 
    Non-examples (learned traits):
Left or right handed, being rude or nice, want to learn or not, listener or non- listener.
4. Explain where genes are found in your body.
 Genes are found in the nucleus.
5. Explain what genes are responsible for.
 They are responsible for your appearance and what traits have been passed on.
6.  Post a picture of a chromosome and explain what it does.

 A chromosome is what carries all of your traits and genes.

7. Post a picture of a nucleus and explain what it does.

 The nucleus has the chromosomes stored inside of them, which carry your traits and genes.

8. Explain what a dichotomous key is.
 Dichotomous key is a key used to determine with logical choices to categorize a species.
9. Explain variation and how it allows natural selection to take place and give examples.
 Variation is whenever you have a different quality/trait that may or may not help you survive in your ecosystem. Variation allows natural selection to occur because the more specialized or helpful variation you have, the more likely you are to survive and reproduce. If you have unhelpful traits, then you are less likely to survive and reproduce.

    Variation: Different skin pattern, necks, color of fur, camouflage ability.
    Natural Selection: short or long necks, white or black fur, camouflage or no camouflage.
    Give examples of variation allowing natural selection to take place:If your neck is not long enough to reach the leaves, you will not be able to eat. If you live in the snow and your fur is black, you will not be able to camouflage which will result in you being an easy target as prey for others.
10.  Explain how adaptations occur and give examples.
    How adaptations occur: The more time that a species is able to live in their economy,the better its adaptations are. Those who did not adapt well eventually will die, those whose traits were more helpful pass it on as an adaption to the next generation.
    Examples: migration, lungs, limbs, hibernation.
11. Explain what might happen if a disease struck a population of animals without great genetic diversity (Don't adapt well).
The disease would soon kill most of the animals anyway because the animals weren't adapted to having a disease or to their ecosystem.
·      What type of offspring is more likely to adapt to their environment and over come disease? Why?
A type of animal that has special characteristics that are helpful and keep them alive. If their ancestors have lived there for a long time, then  they're adaptions must have improved over the years. The improving of adaptions would help to over come a disease if others have gone through it and survived.
·      What type of internal structures or external structures help organisms survive?
Internal if your mentality is smart enough to notice when something is poisonous, if you are being lead into a trap, if there is a predator at the tip of your nose..
External if your genes were on your side and were able to camouflage with your surroundings, if you were able to change form or something.. 
12. List some examples of selective breeding and natural selection.

    Selective Breeding: labrador and golden retriever puppies, white horses, blue cows

    Natural Selection: long necks, long tongues, run faster.

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