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Biology > B6 > Flashcards

B6 Flashcards

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1
Q

Is mitosis asexual or sexual reproduction

A

Asexual

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2
Q

Is meiosis asexual or sexual reproduction?

A

Sexual

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3
Q

What is the first stage of mitosis?

A

-The DNA replicates to form two copies of each chromosome
- also grows and copies its internal structure such as mitochondria and ribosomes

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4
Q

What is the second stage of mitosis?

A

One set of chromosome is pulled to each end of the cell. The nucleus also divides

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5
Q

What is the final stage of mitosis?

A

The cytoplasm and cell membrane divide to form two identical cells

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6
Q

When does mitosis take place?

A

When an organism repairs itself eg when a broken bone heals

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7
Q

How many daughter cells does mitosis produce?

A

2

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8
Q

Are the daughter cells of mitosis identical?

A

Yes

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9
Q

Unlike mitosis cell division, by meiosis, only takes place in…

A

Sex organs

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10
Q

What do we have at the end of meiosis?

A

Four non-identical haploid gametes

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11
Q

How many times does the cell divide in meiosis?

A

Twice

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12
Q

Variation can be due to differences in…

A
  • the genes that have been inherited
  • the conditions in which they have developed (environmental cause)
  • a combination of genes and environment
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13
Q

All species of living things have evolved by…

A

Natural selection

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14
Q

What is natural selection?

A

A process where organisms that are a better adapted to an environment will survive and reproduce

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15
Q

Fossils could be

A

-The actual remains of an organism that has not decayed
Mineralised forms of the hard parts of an organism such as bones
Traces of organisms, such as footprints or burrows

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16
Q

What are the steps of selective breeding?

A
  1. Choose a parent who have the desired characteristic
  2. Select the best offspring and breed these to make the next generation
  3. These offspring are then bred again and again over many generations until a desired result is achieved
17
Q

To reduces the rate at which antibiotic resistant strains appear, we should:

A
  • only use antibiotics when they are really needed, not for treating non serious infections
  • patients should complete their courses of antibiotics even if they start to feel better
  • the agricultural use of antibiotics should be restricted

Biology (7 decks)

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