DNA
A pairs with
T
A base is missing
Definition of Homozygous
2 alleles that are identical (both capital or lowercase)
If R=round seeds and r= wrinkled seeds
Cross RR x rr
What percentage of offspring will be round
100%
What are the driving forces of natural selection?
Survival and reproduction
C pairs with
G
What is an insertion mutation?
A base is added.
Definition of heterozygous?
If R=round seeds and r= wrinkled seeds
Cross Rr x Rr
What percentage of offspring will be round?
75%
What role do mutations play in natural selection?
They introduce new traits to the population
How many chromosomes do humans have
46
What is an translocation mutation?
Definition of phenotype?
Physical appearance of a trait
If R=round seeds and r= wrinkled seeds
Cross Rr x rr
What percentage of offspring will be round?
50%
true or false all mutations will be passed on and become part of the population?
false
The shape of DNA
Double Helix
What is an inversion mutation?
Definition of genotype?
The 2 alleles a person has
If R=round seeds and r= wrinkled seeds
Cross Rr x Rr
What percentage of offspring will be homozygous dominant?
25%
Who came up with the idea of natural selection?
Charles Darwin
DNA is made of what three parts
Sugar, Phosphate group, nitrogenous base
What can cause mutations?
Environmental factors I.E radiation
Definition of adaptation?
If R=round seeds and r= wrinkled seeds
Cross Rr x Rr
What percentage of offspring will be heterozygous?
50%
Describe the difference between natural selection and selective breeding
Natural selection happens on its own due to survival and reproduction, selective breeding is a result of human intervention for a specific trait