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biology paper 2 > B6 > Flashcards

B6 Flashcards

1
Q

what is DNA

A

Deoxyribeonucleuic acid

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2
Q

what shape are DNA

A

Double helix

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3
Q

what is a genome

A

entire set of genetic material

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4
Q

what is a phenotype

A

characteristics

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5
Q

what is heterozygous

A

two different genes

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6
Q

what is a homozygous gene

A

two of the same gene

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7
Q

what is an allele

A

two different versions of the same gene

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8
Q

is cystic fibrosis dominant or reccessive

A

reccessive

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9
Q

what poldactyl dominant or reccessive

A

dominant

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10
Q

what can genetic engineering make

A

bacteria can be made into insulin

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11
Q

what are the issues with genetically modified crops

A

health issues
crops can spread

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12
Q

what are the classifications

A

kingdom
phylum
order
family
genus
species

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13
Q

what are the 3 domains

A

archea
bacteria
eukaryotes

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14
Q

what chromosones do females have

A

XX

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15
Q

What chromosones do males have

A

XY

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16
Q

what is the theory of evolution

A

all of todays species have evolved from simple life forms that first started to develop over 3 billion years ag0

17
Q

what are the reasons for extinction

A

environment changes too quickly
new predator
new disease

18
Q

what are the 3 ways fossils are formed

A

casts and impression
gradual replacement of minerals
preservation

19
Q

how are fossils formed through casts and impressions

A

buried in soft materials like clay , clay hardens around it

20
Q

how are fossils formed through preservation

A

no oxygen or moisture so decay microbes cannot decompose it

biology paper 2 (2 decks)

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