B1 OCR

HideShow resource information
Where are chromosomes found whithin a cell?
The nucleus
1 of 25
How many chromosomes do Humans have?
46, 23 pairs
2 of 25
What are alleles?
Different versions or types of genes
3 of 25
How do genes control the different characteristics we develop?
Each gene is a code for making a certain protein. Proteins are the building blocks of cells
4 of 25
What does 'Genotype' mean?
An organism's genotype is all of the genes it has
5 of 25
What does 'Phenotype' mean?
The physical appearance of an organisms characteristics
6 of 25
Is weight determined by Genes, environmental or both?
both
7 of 25
Name the two types of sex cell
Egg (female gametes) and sperm (male gametes) cells
8 of 25
How many chromosomes are found in sex cells?
23 chromosomes
9 of 25
Why do most children look like their parents but not identical to either?
Half a child's chromosomes have come from each parent. The child doesn't have the same alleles
10 of 25
Difference between Homozygous and Heterozygous?
Homozygous = two of the same alleles for that particular gene Heterozygous = two different alleles for that particular gene
11 of 25
What sex chromosomes do humans have?
** = Female xy = Male
12 of 25
Is the allele for cystic fibrosis dominant or recessive?
Recessive
13 of 25
What are the symptoms of cystic fibrosis?
Thick sticky mucus in the lungs. Breathing difficulty. Chest infections
14 of 25
What are the symptoms of huntingtons' disease?
Tremors, clumsiness, memory loss, poor concentration
15 of 25
What are the chances of a child inheriting HD if one of their parents have the faulty gene
50%
16 of 25
During IVF, what is the process of testing embryos to see if they have a genetic disorder?
pre-implantation genetic diagnosis (PGD)
17 of 25
Give another use for genetic testing
Children and adults can be checked to see if they carry alleles for genetic disorders
18 of 25
Issues surrounding genetic testing
1) Tests aren't 100% safe 2) Tests aren't 100% accurate 3) Insurance companies might refuse to give life insurance
19 of 25
Definition of 'clone'
Clones are Genetically Identical organisms - they have the same genes and alleles of those genes
20 of 25
How are identical twins formed?
Identical twins are also clones. The embryo splits into two
21 of 25
Definition of asexual reproduction
Only one parent, and the offspring are genetically identical to the parent
22 of 25
What are Stem cells?
During the development of an embryo most of the cells become specialised. They cannot later change to become a different type of cell. But embryos contain a special type of cell called stem cells.These can grow into any type of cell found in the body
23 of 25
Differences between the two main types of stem cells
Embryonic stem cells = unspecialized cells found in early embryos Adult stem cells = unspecialized cells found in adult animals
24 of 25
How can stem cells treat an illness?
Embryonic stem cells can be used to replace faulty cells
25 of 25

Other cards in this set

Card 2

Front

How many chromosomes do Humans have?

Back

46, 23 pairs

Card 3

Front

What are alleles?

Back

Preview of the front of card 3

Card 4

Front

How do genes control the different characteristics we develop?

Back

Preview of the front of card 4

Card 5

Front

What does 'Genotype' mean?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Adaptations of organisms to their environment resources »