A plane curve has parametric equations 
and 
.An expression for the rate of the slope of tangent to the path of the curve is
Definitions:
Heterozygote Advantage
A genetic phenomenon where individuals with two different alleles for a particular trait have a greater fitness than individuals with two identical alleles.
Balanced Polymorphism
The presence in a population of two or more genetic variants that are maintained in a stable frequency over several generations.
Frequency-Dependent Selection
A mechanism of natural selection where the fitness of a phenotype depends on its frequency relative to other phenotypes in the population.
Infant Survival
The probability or rate of survival of newborn organisms through their earliest stages of life, often influenced by factors like genetic health, parental care, and environmental conditions.
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