Flashcards in First Test Deck (13):
Define natural selection
the process whereby organisms better adapted to their environment tend to survive and produce more offspring.
Change in the characteristics of a species over many generations
An example of natural selection
In a habitat there are red bugs and green bugs. The birds prefer the taste of the red bugs, so soon there are many green bugs and few red bugs. The green bugs reproduce and make more green bugs and eventually there are no more red bugs.
Selective breeding by combining a desirable feature of one individual with another in the offspring
The observable characteristics eg tall
The allele information eg Tt
What is dominate disease
this occurs when a person has one disease allele but it over powers the other normal gene. The person is affected by the disease.
This occurs only when two of the abnormal gene are present (homozygous). One from each parent.
Heterozygous- allele information that is different. Eg Aa
Homozygous- allele information that is the same. Eg aa or AA
Carrier- the person that has a specific trait and carries it to someone else in their family.
Define true breeding
Pure bred an organism that always pass down similar traits