April Test 2 Flashcards Preview

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Flashcards in April Test 2 Deck (37)
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1

What is an allele?

Different versions of the same gene

2

If the sperm contains X chromosomes what will the gender be?

Girl

3

If the sperm contains Y chromosomes what gender will it be?

Boy

4

A dominant allele is shown how?

Capital letter

5

How is a recessive allele shown?

Lowercase letter

6

In blood types,

Ao will be =
Bo will be =
oo will be =
AB will be =

A
B
o
AB

7

Blood types A and B are equal strength, what is this called?

Codominant

8

If two of the same allele are paired up what is it called?

Homozygous

9

If two different alleles are paired up what is it called?

Heterozygous

10

What is a genotype?

The set of genes RESPONSIBLE for a particular trait

11

What's a phenotype?

The characteristics of a trait

12

What is a zygote?

When male and female gametes combine

13

What chromosome does the egg only carry?

X

14

What is a genome?

All the DNA in an organism

15

What is the spinal cord?

A long column of neurones that runs down the spine

16

What does the spinal cord do?

Relays info between the brain and the rest of the body

17

Give a function of the cerebellum

Responsible for balance

18

Give a function of the medulla oblongata

Controls unconscious activities

19

What does a CT scanner do? What does it NOT do?

Uses X-rays to produce an image of the brain

Does not show the functions of brain parts

20

What does a PET scan do?

Use radioactive chemicals to show which parts of the brain are active

21

Why is it hard to repair damage to the nervous system?

Neurones don't repair themselves

22

What are sensory receptors?

Groups of cells that can detect a change in the environment (a stimulus)

23

Explain how we react to a stimulus

•When the stimulus is detected, the info is converted to an electrical impulse and sent along sensory neurones to the CNS
•The CNS decides what to do and impulses travel along relay neurones
•The info is sent to a muscle or gland along a motor neurone and the muscle or gland reacts accordingly

24

What do dendrites and dendrons do?

Carry impulses TOWARDS the body

25

What do axons do?

Carry nerve impulses AWAY from the cell body

26

Explain the sensory neurone

•one long dendron carries impulses from receptor cells to the cell body

•one short axon carried impulses from there to the CNS

27

Explain the motor neurone

Many short dendrITES carry impulses from the CNS to the cell body

One long axon carried them from there to the effector cells

28

Explain the relay neurone

•many short dendrITES carry impulses from sensory neuromas to the cell body

•an axon carries impulses from there to the motor neurone

29

What is the connection between two neurones called?

A synapse

30

What is the nerve signal transmitted by?

Neurotransmitters