Inheritance DNA & Evolution - DNA & Inheritance Flashcards

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1
Q

what is DNA classed as and what structure does it have

A

polymer

double helix structure

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2
Q

what is DNA made up of

A

chromosomes

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3
Q

what are genes

A

small section of DNA found on a chromosome

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4
Q

what does a gene do

A

codes for a particular sequence of amino acid which are put together to make a specific protein

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5
Q

how many amino acids are used

A

20 but they make thousands of different proteins

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6
Q

what determines what type of cell something is

A

dna determines what protein the cell produces that in turn determines what cell it is

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7
Q

what is a genome

A

entire set of genetic material in an organism

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8
Q

what is understanding the human genome important for

A

identifying genes that are linked to diseases
so can develop effective treatment for them

can trace migration of populations of people around the world. Scientist study differences in genome to work out when new pops slit off

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9
Q

DNA is made of repeating units called what

A

nucleotides

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10
Q

what do nucleotides consist of

A

one sugar molecule and one phosphate molecule and one of 4 bases

the sugar and phosphate molecules alternate and the base sticks out

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11
Q

what are the 4 bases of DNA

A

A C G T

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12
Q

what decides the order of amino acids in a protein

A

order of the base in a gene

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13
Q

each amino acid is coded by what

A

sequence of three bases

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14
Q

how is DNA kept in a helix structure

A

each base is linked to a base on the opposite side of the structure.

A pairs with T

C pairs with G

this is called complementary base pairing

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15
Q

what do non coding parts of DNA do

A

switch genes on and off. so control if gene is expressed (used to make a protein)

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16
Q

where are proteins made

A

in cytoplasm on structures called ribosomes

17
Q

what do ribosomes use to know how to make proteins

A

code in DNA

18
Q

how does the ribosome get the code from the DNA

A

a molecule called mRNA carriers the copied code and acts as a template

19
Q

how are the correct amino acids brought to the ribosomes in the correct order

A

by carrier molecules

20
Q

what happens when a chain of amino acids has been assembled

A

folds into unique shape

21
Q

what are 3 functions of proteins

A

enzymes
hormones
structural proteins

22
Q

what is a mutation

A

a random change in an organisms DNA

can sometimes be inherited

23
Q

when do mutations happen

A

continuously.
e.g spontaneously when a chromosome isn’t replaced properly

chances increase by exposure to certain substances or some types of radiation

24
Q

what do mutations do

A

change the sequence of DNA bases in a gene which produces a genetic variant

this can lead to changes in the protein it codes for which will effect its ability to perform its function

however most mutations have very little or no effect on the protein

25
Q

what is an example of how a protein may not work due to mutation

A

collagen could lose strength if shape is changed

26
Q

what are insertions

A

a new base is inserted into DNA base sequence where it shouldn’t be . This causes the way the group of 3 bases for an amino acid is read which can change the amino acid. Insertions can change more than one amino acid as they have a knock on effect on the bases further in the sequence

27
Q

what are deletions

A

random base is deleted from dna which changes the way the base is read and has knock on effects further down the sequence

28
Q

what is a substation

A

mutation where random base sequence is changed to a different base

29
Q

what is sexual reproduction

A

where genetic infomation from 2 organisms is combined to produce offspring genetically different to each parent

30
Q

what does a gamete contain

A

23 chromosomes so one of each chromosome

31
Q

what is fertilisation

A

egg and sperm fuse together to form a cell with full number of chromosomes

32
Q

what is asexual reproduction

A

one parent so clone is identical. happens by mitosis

33
Q

what happens in meiosis

A

cell duplicates genetic information forming 2 armed chromosomes and arrange themselves into pairs

line up in centre of cell then pull apart so each new cell only has one copy of each chromosome

they line up and split again

then the chrosomes end up random thAT ARE IN THE 4 GANETES FORMED

34
Q

what happens in embryo development

A

cells divides using mitosis to produce lots of new cells. as embryo develops they begin to differentiate into specialized cells

35
Q

advantages of sexual reproduction

A

variation because of mixture of 2 sets of chromosomes

this increases species chances of surviving a change in environment because individuals willhave charecteristics that make them better adapted

they will then breed and ass their characteristics

selective breeding speeds up natERAL SELECTION so we can increase food productionon

36
Q

advantages of asexual reproduction

A

only needs to be one parent so less energy and faster

many identical offspring can be produced in favourable conditions

37
Q

how can malaria produce offspring

A

parasite transfered to human in mosqito bite and produces asexually

produces sexually when its in the mosquito

38
Q

what can produce sexually and a sexually

A

fungus

39
Q

what are runners

A

stems that grow horizintally away from plant which is an asexual reproductive method by strawberrys