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Level 269

Variation


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discontinuous
Features that fall into separate, non-overlapping groups
Continuous
is a quantitative variable that has a continuum of infinitely many possible values
categoric
A type of variable where the values designate different categories
normal distribution
Bell-shaped probability distribution where the frequencies start low, then increase to one or two high frequencies, then decrease to a low frequency. The distribution is approximately symmetric.
Mode
the most common value
Median
A segment or Ray that joins a vertex to the midpoint of the opposite side
mutation
A change in the order of the bases in an organism's DNA
point mutation
When only 1 base is changed in DNA
deletion
Type of mutation in which a base is removed
Substitution
The replacement of letters/variables in an algebraic expression.
meiosis
Cell division that produces gametes that are genetically different to each other
independent assortment
Random distribution of the pairs of genes on different chromosomes to the gametes
random fertilisation
The random combination of chromosomes resulting from a pairing of a sperm with an egg
twin studies
Method of investigating whether genes or environment affect phenotype the most for a particular feature
monozygotic
Also called identical twins; twin siblings that result from one zygote splitting in two and therefore share the same genes
dizygotic
Also called fraternal twins; twin siblings that result from two separately fertilised eggs and therefore are no more similar genetically than normal siblings
concordance
When one twin has a particular feature, this is the percentage of the other twin that also has that feature
discordance
Expression of a feature in one twin but not a second
Prader-Willi syndrome
Caused by a lack of genetic material in the 15 pair of chromosomes and is usually inherited from the father
DNA methylation
Inactivates genes via adding a methyl group to bases in DNA
epigenetic imprinting
Inheritance of traits transmitted by mechanisms that don't involve a change in DNA sequence
Variation
Difference of values; spread
Why might some people dislike broccoli or olives and other people like it?
because some people can taste bitter chemicals in them. Other would just like the taste.
Explain variation
are the differences that exist between same species
Give examples of variation
hair colour, skin colour, height, sex (gender), body mass, eye colour, blood group, fingerprints, face shape,
List five features which vary between your classmates?
height, sex (gender), hair color, body mass, eyes color, skin color
I can tell who it is by its face, hair, sex, voice or way of walking
In a distance you spot a friend in the mall. How can you tell who it is?
Which features do you use to recognize or identify people that you knew?
by their face, hair, eyes, body mass, voice, distinct ways of walking, gender, age,
Which differences or variations can be spotted easily?
the external features, like height, hair color, skin color, body mass, sex
by her face because faces don't change so much.
Your cousin Brit has grown a lot since you saw her long time ago. Her hair now is shorter and she has dyed it blond. Why do you still recognize her?
Do you think we have hidden differences?
Yes, it is. Like blood group, fingerprints, behavior, preferences
Explain why photos can't show all our differences?
Because it can't show how our body work, blood group, fingerprints, behavior.
Why not every person act or look the same?
Because everyone has a different combination of features, so we are all unique.
Despite that we are unique, do we share common features?
yes, like hair color, skin color, eye color, shoe size
List three features that are unique between people?
fingerprints, eye (iris) color pattern, shape of the face.
What do you understand by biometric system?
devices that use our unique features to identify people.
How biometric system are used to identify us?
They use our unique features to identify us.
two types of variation
Environmental variation and inherited variation
Environmental variation
Features of an organism changed by its surroundings
inherited variation
the features we get from our parents.
environmental factors
factors of an organisms surroundings
Piercings
name 5 environmental variations
light,wind,fire
Name 3 environmental factors
Upturned/straight nose
Name 5 inherited variations
Relationship
What we have when one variable depends on another.Cause and effect between 2 varibles.
Offspring
Children
Species
term that is more specific, narrow, or concrete than the original term and in included by it
a line graph.
What is a relationship normally shown on.