B2.7

Question 1

In plants and animals what are passed down

Answer 1

Characteristics

Question 2

How would u present different characteristics

Answer 2

In a simple diagram

Question 3

How are body cells divided

Answer 3

Mitosis

Question 4

What do chromosomes contain

Answer 4

The genetic information

Question 5

What happens during mitosis

Answer 5

Duplicate chromosomes
Line up at centre
Cell fibre pull them apart 
Membranes form around each chromosome
Become nucleus
Cytoplasm divides

Question 6

What is mitosis used for

Answer 6

Growth or to produce replacement cells

Question 7

How many sets of chromosomes do body cells have

Answer 7

2

Question 8

How many sets of chromosomes do gametes have

Answer 8

One

Question 9

What do cells in reproductive organs have to do to form gametes

Answer 9

Divide

Question 10

What is meiosis

Answer 10

A type of cell division in which a cell divides to form gametes

Question 11

Process of meiosis

Answer 11

Mitosis
Pulled apart
Pulled apart again 
Four gametes 
Each with a single set of chromosomes

Question 12

What do gametes do at fertilisation

Answer 12

Join together and single body cell is formed

Question 13

What is the difference between plant and animal differentiation

Answer 13

Animals differentiate at an early stage

Plants differentiate for life

Question 14

What is cell division restricted to in mature animals

Answer 14

Repair and replacement

Question 15

What can be differentiated into any human

Answer 15

Stem cells

Question 16

What do we know if the reproduction process was asexual

Answer 16

Used mitosis

Question 17

Why does sexual reproduction allow variation

Answer 17

Gametes fuse so one of each allele comes from each parent

Question 18

How many pairs of chromosomes determine the gender of the child

Answer 18

1

Question 19

What are the female sex chromosomes

Answer 19

XX

Question 20

What are the male sex chromosomes

Answer 20

XY

Question 21

What are some characteristics controlled by

Answer 21

A single gene

Question 22

What is a dominant allele

Answer 22

Controls the development of a characteristics when it is present on only one of the chromosomes

Question 23

What is recessive allele

Answer 23

Controls the development of q characteristics only if the dominant allele is not present

Question 24

What is dna

Answer 24

Deoxyribonucleic acid- what chromosomes are made of in a double helix structure

Question 25

What is a gene

Answer 25

Small section of dna

Question 26

What is a gene code

Answer 26

A particular combination of amino acids which makes a specific protein

Question 27

Everyone has unique dna expect

Answer 27

Identical twins

Question 28

What is dna fingerprinting

Answer 28

Process to identify individuals, paternity test and forensic science

Question 29

What are some diseases

Answer 29

Inherited

Question 30

What is polydactyly

Answer 30

Extra fingers or toes caused by a dominant allele of gene and can only be passed by only one parent who has the disorder

Question 31

What is cystic fibrosis

Answer 31

A disorder of cell membrane

Question 32

How is cystic fibrosis inherited

Answer 32

Parents must be carriers or have the disease and caused by recessive allele

Question 33

What can happen to embryos to show the allele that causes genetic disorders

Answer 33

Screened

Question 34

What do genes do

Answer 34

They tell cells in what order to put amino acids together

Question 35

What does DNA fingerprinting do scientifically

Answer 35

Cuts up a persons DNA into small sections and then separating them

Question 36

What is mitosis

Answer 36

When a cell reproduces itself by splitting to form two identical offsprings

Question 37

Advantages of stem cells

Answer 37

Cure diseases | Eradicate diseases

Question 38

Disadvantages of stem cells

Answer 38

Embryos potential life | Curing patients are more important than embryos

Question 39

What do genetic diagrams show

Answer 39

The possible combinations of gametes

Question 40

What dis Mendel used

Answer 40

Pea plants

Question 41

What conclusions did Mendel came to

Answer 41

Characteristics in plants are determined by hereditary units Hereditary are passed on from both parents and one unit from each parent Dominant allele is shown

Question 42

What are alleles

Answer 42

Different versions of the same gene

Question 43

How many alleles do gametes have

Answer 43

1

Question 44

What so we call it when two alleles are the same

Answer 44

Homozygous

Question 45

What do we call two different alleles

Answer 45

Heterozygous

Question 46

What happens during ivf

Answer 46

Embryos are fertilised in a laboratory implanted into mothers womb

Question 47

Why is more than one egg fertilised in ivf

Answer 47

More chance to be successful

Question 48

How can cystic fibrosis be identified

Answer 48

IVF and embryo screening

Question 49

Advantages of embryo screening

Answer 49

Help people suffering Laws to stop going far Treating disorders is too expensive

Question 50

Disadvantages to embryo screening

Answer 50

Expensive Could have been life if rejected Desirable characteristics may be wanted