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Bella S2 Cells & DNA

S2 Inheritance & DNA

What is a gamete a sex cell
Where does fertilisation take place? Oviduct (fallopian tube)
What is the name of the cell formed when fertilisation takes place? Zygote
What is the definition of fertilisation? When the nucleus of the sperm fuses with the nucleus of the egg (ovum)
Why is an egg bigger than a sperm Cytoplasm contains a food store
What is a gene? Part of a chromosome that codes for a characteristic
What are genes and chromosomes made of? DNA
What parts of DNA join the two strands together? Bases
Why can DNA be used to identify people? Because everyone's DNA is different (except identical twins)
When might you want to use DNA to identify a human? To prove who the parents are To identify a body part or unrecognisable body To identify a criminal
When might you want to use DNA to identify an animal? To identify what meat is in your food To identify the owner of a dog that doesn't clean up after it. To match bones to species
What are the risks of using DNA profiling to identify a human Mistakes can still be made by people handling evidence. DNA can easily be planted at a crime scene Families can be torn apart by paternity tests.
From what cells can you collect DNA for profiling? From skin cells From sperm From saliva From blood
How is DNA treated to perform DNA profiling DNA collected DNA cut into fragments by enzymes DNA fragments put into gel electrophoresis DNA gets separated into banding patterns
What does it mean if a gene is DOMINANT It will always be present
How many genes control a characteristic Two
Gender, eye colour and tongue rolling are examples of what type of variation? Discrete
Height, mass and hand span are examples of what type of variation? Continuous
Name an example of an environmental variation Tatoos, Scars etc
What are alleles? Different forms of a gene
What is the name for the differences between the members of a species Variation
What combination of sex chromosomes do you have if you are female? XX
Name a genetic disorder Down's syndrome Huntington#s disease Cystic Fibrosis Muscular Dystrophy
How many elements are there in DNA? five
How many chromosomes are ther in a human sperm? 23
What are the elements in DNA? Carbon, Hydrogen, Oxygen, Nitrogen, phosphorous
Give an example of continuous variation Size of...anything
Give an example of discrete variation Tongue rolling, gender, handedness Anything observable...
What is the function of the chloroplast Site of photosynthesis
What percentage chimpanzee are you? 98%
Created by: nscobie