Genetics

What Makes Us Who We Are?

What is the Study of Genetics

Genetics is the branch of biology that studies heredity in organisms.

Who Discovered Genetics and How Did He Do This?

Gregor Mendel discovered genetics while in his garden looking at his pea plants.  He noticed changes in the generations of plants and that one generation might be tall but the next might be short.

The Difference between Dominant/Recessive Alleles; Heterozygous/Homozygous; Genotype/Phenotype

Dominant Trait- Observed trait of an organism that masks the recessive form of a trait.     Recessive Trait- Trait of an organism that can be masked by the dominant form of a trait.     Heterozygous- When there are two different alleles for a trait.     Homozygous- When there are two identical alleles for a trait.     Genotype- Combination of genes in an organism.     Phenotype- Outward appearance of an organism, regardless of its genes.

Example of a Punnett Square

Genotype: 50% yellow 50% green. Phenotype: 50% Yy 50% yy

Incomplete Dominance

Incomplete dominance is an inheritance pattern where the phenotype of a heterozygote is intermediate between those two homozygotes; neither allele of the pair is dominant but combine and display a new trait.

Codominance

Codominance is the pattern where phenotypes of both homozygote parents are produced in heterozygous offspring so that both alleles are equally expressed.

What Are Multiple Alleles and What Are They Used to determine?

Multiple alleles are the presence of more than two alleles for a genetic trait. They can be used to find the possible blood types of an offspring.

What are Sex-Linked Traits?

Sex-linked traits are traits controlled by genes located on sex chromesomes.