Cell Basics
What is the basic building block of all living things?
Cell!
What is the main purpose of mitosis?
What type of cells does meiosis help create?
Reproductive cells (egg and sperm)
What molecule carries genetic instructions
DNA
Are all people genetically exactly alike?
NO!
What is one reason your body needs to make new cells?
For growth and repair
How many new cells usually result from mitosis?
2
How many cells usually result from meiosis?
4
Where are chromosomes located in most human cells?
In the nucleus
What is one reason siblings can look different from each other?
They inherit different combinations of DNA.
What important information is stored inside DNA?
Genetic Instructions
Name one reason your body uses mitosis.
Growth and/or tissue repair
Do cells made through meiosis have a full or half set of chromosomes?
Half a set
What are chromosomes made of?
DNA and proteins
What is crossing over?
When matching chromosomes exchange sections of DNA.
What is the name for the process where a cell divides to make two matching cells?
Mitosis
Before a cell divides, what happens to its DNA?
It is copied (replicated)
Are the cells made through meiosis genetically identical or varied?
Genetically varied (different)
What are the two matching halves of a copied chromosome called?
Sister Chromatids
Does meiosis help create genetic variety or genetic sameness?
Genetic variety.
Why is it important that new body cells receive DNA?
So that they have the information they need to function
Why do the two new cells need matching DNA?
So both receive the genetic instructions needed to function.
Why is it important for reproductive cells to have half the usual chromosome number?
So that when egg and sperm join, the full chromosome number is restored.
What connects the two sister chromatids?
Centromere
Why is genetic variety interesting or important in living things?
Open ended!