Clover, Graphing & Survival of the Sickest

Unit 0: Clover, Graphing & Survival of the Sickest

Cyanogenesis (in clover)

A defense mechanism where clover produces hydrogen cyanide ($HCN$) when damaged.

Primary evolutionary benefit of cyanogenesis

It deters herbivores from eating the plant.

Herbivory

The consumption of plant material by animals.

Genotype

An organism's underlying genetic makeup.

Phenotype

An organism's observable physical or physiological traits.

Method used to determine clover genotype in lab

Analyzing observed experimental phenotypes using a defined genetic model.

Relationship between climate and cyanogenesis

Climate influences herbivore presence and frost risk, altering the costs and benefits of cyanogenesis.

Core takeaway of the Clover Lab

Both genetic makeup and environmental conditions dictate which traits enhance survival.

Primary use of a line graph

To display continuous change or trends over time.

Primary use of a scatterplot

To illustrate the relationship or correlation between two numerical variables.

Primary use of a bar graph

To compare discrete data across different groups or categories.

Graph axis reserved for the independent variable

The x-axis.

Graph axis reserved for the dependent variable

The y-axis.

Independent variable

The variable that is manipulated or changed by the experimenter.

Dependent variable

The variable that is measured or observed as the outcome.

Positive relationship (in data)

A trend where an increase in one variable corresponds to an increase in the other.

Negative relationship (in data)

A trend where an increase in one variable corresponds to a decrease in the other.

Outlier

A data point that strays significantly from the overall pattern of a dataset.

Method for supporting a scientific claim

Providing specific data as evidence and applying logical reasoning to connect it to the claim.

Three essential components of a scientific argument (CER)

Claim, Evidence, and Reasoning.

Central theme of Survival of the Sickest

Traits that cause disease today may have provided survival advantages in past environments.

Evolutionary concept demonstrated by malaria resistance

Natural selection and evolutionary trade-offs in response to infectious disease.

Evolutionary concept demonstrated by favism (G6PD deficiency)

A genetic trait's impact depends heavily on environmental interactions.

Evolutionary concept demonstrated by skin pigmentation variations

Environmental factors like UV exposure dictate which physical traits are adaptive.

Evolutionary concept demonstrated by hemochromatosis

A genetic condition carrying health costs can persist if it offered historical survival benefits.

Evolutionary trade-off

A situation where a trait provides a survival advantage while incurring a physiological cost.

Shared core principle between Survival of the Sickest and the Clover Lab

Environmental factors dictate whether specific genetic traits are advantageous or detrimental.

Biological pathway from genes

Genes code for proteins that determine observable traits and phenotypes.

Role of the environment in natural selection

It acts as a filter, determining which traits increase survival and reproduction.

Primary selection pressure on clover plants

Herbivores consuming the plant.

Primary defense mechanism in clover against herbivores

Cyanogenesis.

Graph type best for showing change over time

Line graph.

Graph type best for showing relationships between two numerical variables

Scatterplot.

Graph type best for comparing distinct categories

Bar graph.

Genotype vs. Phenotype distinction

Genotype is the genetic sequence; phenotype is the expressed physical trait.

Natural selection

The process where organisms with beneficial inherited traits survive and reproduce at higher rates.