Inheritence Flashcards

1
Q

What is DNA

A

A massively long structure which super coils itself around proteins in the body in order to form chromosomes. These are ‘X-like’ structures which tidy up the nucleus.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Why do the DNA latch onto proteins in the body?

A

Because they are readily available

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the purpose of super coiling.

A

It tidied up he nucleus due to tight coiling and allows everything to fit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Where are genes found?

A

On the chromosomes

Genes are bands on chromosomes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Female gene formation

A

XX

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Male gene formation

A

XY

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What determines whether the child will be a boy or a girl?

A

The sperm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Describe how genes, chromosomes and DNA are all linked

A

The DNA form chromosomes, which contain small structures called genes on them.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Where are chromosomes found

A

In the nucleus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How many chromosomes are there in most human cells

A

46

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How many pairs of non sex chromosomes are there and what are their names

A

Autosomes

22 pairs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How many pairs of sex chromosomes are there?

A

One, labelled X and Y

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

A=

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

C=

A

G

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

On the structure of DNA, what does the s stand for

A

Sugar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

On the structure of DNA, what does the p stand for

A

Phosphate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

On the structure of DNA, what is G bonded with C labelled as

A

Nitrogenous bases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is a base, bonded with sugar and phosphate labelled as?

A

A nucleotide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is mitosis

A

A form of cell division that produces two identical diploid daughter cells from a diploid body cell, used for growth and repair in the body and in asexual reproduction. It occurs in all body cells apart from gametes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are the stages of mitosis

A
Interphase 
Prophase 
Metaphase 
Anaphase 
Telophase 

(PMAT)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Mitosis chromosomes

A

Starts off with 46

Goes through DNA replication and has 92

Then separates into daughter cells which each have 46

22
Q

Interphase

A

Before mitosis occurs

90 % of the cycle
DNA replication occurs in it (46-92)
This is because you have to duplicate the genetic material in the cell before splitting, or else they would not have the correct number of chromosomes.

23
Q

Prophase

A

Nuclear envelope disintegrates
DNA supercoil to form chromosomes
The chromosomes take an X structure

24
Q

Metaphase

A

Chromosomes attach to the equator of the cell ‘line up’

25
Anaphase
Spindle fibers drag chromosomes to the piles of the cell. Chromosomes are pulled to the ends of the cell
26
Telophase
The nucleur envelope reforms around the chromosomes, which then unwind. The cell divides (cytokinesis) Two diploid daughter cells form, each containing 46 chromosomes
27
What is the purpose of mitosis?
- growth - asexual reproduction - repair of the tissue - cloning
28
What cells would meiosis make?
Gametes
29
What happens in meiosis?
You have to go through PMAT twice in meiosis because otherwise when the sperm and the egg got together in reproduction, there would be too many chromosomes and they wouldn't function.
30
Meoisis chromosomes
``` 46 92 - DNA replication PMAT 46 46 PMAT 23 23 23 23 haploid daughter cells ```
31
Haploid
Half the genetic number of chromosomes
32
Diploid
Normal amount of chromosomes
33
Why is it important that humans endure meiosis?
Because variation is needed so meoisis creates non- identical daughter cells and sexual reproduction also creates variety
34
What is an allele?
Different versions of the same gene Different characteristics E.g. hair colour gene.
35
Phenotype
The visible physical appearance of an organism based on the expression of genes
36
Heterozygous
The alleles in the organisms are different
37
Homozygous
Both alleles in the organism are identical
38
Recessive
And allele which is only expressed when it is with another identical allele.
39
Dominat
And allele that is always expressed even when it is paired with another allele
40
Genotype
The genetic composition of an organism
41
A gene is
A section of molecule of DNA and a gene codes for a protein
42
DNA molecule
Two strands coiled to form a double helix, linked by a 4 nitrogenous bases AT CG
43
What are alleles
Alternative forms of genes which give rise to differences in inherited characteristics
44
Why do cells need to divide
To replace worn out cells form growth and to replace dead cells
45
List 3 places in ur body where mitosis occurs
Skin, blood, bone marrow
46
When a genetic material of a cell changes it is called
Mutation
47
Describe the relationship between genes and the characteristics of an organism
Each gene codes for a specific protein, the proteins will determine the phenotype
48
Advantages of reproducing sexually
Varied species 2 parents to raise offspring More chance of survival Prevents monoculture
49
Why self-pollinate?
To stop cross pollination | To control the gene pool or prevent other genes getting in
50
Environmental factor that may increase the probability of a random gene mutation
UV, x ray, tar from cigarettes