3 inheritance (b) Flashcards
3.19, 3.20-3.27, 3.38, 3.39
1
Q
what is the genome?
A
- the entire DNA of an organism
2
Q
what is a gene?
A
- a section of a molecule of DNA that codes for a specific protein
3
Q
what does the nucleus contain?
A
- chromosomes
4
Q
where are genes located?
A
- on chromosomes
5
Q
P2 structure of a DNA molecule:
A
- two strands coiled to form a double helix
6
Q
P2 what are DNA strands linked by?
A
- A- adenine
- T- thymine
- C- cytosine
- G- guanine
7
Q
P2 structure of a RNA molecule:
A
- single stranded
8
Q
P2 what does a RNA molecule contain instead of thymine?
A
- U- uracil
9
Q
what is genetic variation?
A
- eye colour
- blood type
10
Q
what is environmental variation?
A
- lifestyle
- diet
- climate
11
Q
what are most phenotypic features the result of?
A
- polygenic inheritance
12
Q
what is an allele?
A
- version of a gene
13
Q
how many alleles do you have of each gene?
A
- two
- they are dominant or recessive
14
Q
what does the dominant allele do?
A
- will always be represented by the bigger letter
15
Q
what does the recessive allele do?
A
- will always be represented by a little letter
16
Q
homozygous dominant meaning?
A
- both dominant alleles are present TT
17
Q
homozygous recessive meaning?
A
- both recessive alleles are dominant tt
18
Q
heterozygous meaning?
A
- the two different forms of alleles are present Tt