Chap 12 Variation F5 Flashcards
Definition of Variation
pg 1
What is variation in a population
the ability to adapt to changing environment
Definition of natural selection
pg1
Necessity of variation(3)
pg 1
Definition of continuous variation
pg 2
Examples of continous variation
height, skin
Continous varaiation is the result_____
2
Definition of discontinous variation
2
eg of discontinous variation
ab blood grp ,eye colour,fingerprint pattern,gender
similarities between continuous and discontinuous variation (3)
3
diff between continuous and discontinuous variation (6)
3
variation in phenotype is caused by (3)
3
4 genetic factors in variation
4
Crossing over occurs between(7)
4
Independant assortment of chromsosomes(2)
5
Ranodom fertilisation
5
Definition of mutation (3)
Permanent chamge which……….(6)
Why is effect of environmental variation small?
6
Why environmental variation cannot be inherited
only can change alllele frequency
Environmental factors in plants
light,ph value of soil
water supply
Environmental factors in humans
food
sunlight
climate
exercise
Phenotype=
8
When is dominant trait observed
9
Why mutations occur(4)
14
What is mutagen
substance which causes mutation/increase mutation rate
Types of mutagen
14
Types of gene mutation(3)
15
When gene mutation occur
15
Effects of gene mutation
15
Causes of sickle cell anemia
16
causes of albinism
17
Causes of cystic fibrosis
17
Causes of haemophilia
18
Types of chromosomal mutation(4)
19
Effects in chromosomal duplication (2)
20
Effects in chromosomal inversion
20
Effects of translocation (2m)
20
Explain changes in chromosomal number (3m)
21
Down syndrome
22
turner syndrome
22
klinefelter syndrome
23
Jacob syndrome
23
Similarities and diff between mutation in somatic cells and gametes
24
