Bio Principles Lecture Exam 1

How long do skin cells last?

About 2-4 weeks

How long do hair cells last?

2-7 years

What does UV radiation do?

Delays anaphase by up to 40 minutes which can ruin the progress from metaphase

How are chromosomes numbered?

By size

Homologous chromsomes

Each pair of chromosomes coding of the same trait

Prophase I

Each chromatid makes a copy and crossing over occurs

Evolution

Inherited changes over time

Law of segregation

You can only inherit one gene or another from a parent, not both

Law of independent assortment

Genes are randomly passed om

Fitness

The ability of an organism to produce live and viable offspring

Agouti gene

Changes color of shaft of hair

Microevolutionary Mechanisms

Affects allele frequency

With enough mutation

The original species —> 2+ species

Gene flow

Movement of individuals from 1 location to another

Tropical Rainforest

More rainfall, smaller temperature range (higher), lots of biodiversity, only a rainy and dry season

Plants in the desert

Ground hugging, water storage, opportunistic

Ecology

Study of organisms in relation to their environment

Logistic Growth curve

Population reaches K (Carrying capacity) and waves around that line, more common

Population Ecology

Studies the structure and dynamic of 1 population

Bald Eagle Biomagnification

DDT when all the way from water up to the eagle and eagle eggs were super soft