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Genetics

Genetic Traits

QuestionAnswer
Allele A gene that has two forms.
Genotype A pair of alleles that are the genetic makeup of an organism.
Phenotype An organism's physical appearance.
Gregor Mendel Known as "Father of Genetics"
Pure-bred Offspring bred from parents of the same breed.
Cross Fertilization When the male and female sex cells from different organisms of a species are fertilized.
Homozygous Having two of the same alleles for a gene. HH or hh
Heterozygous Having two different alleles for a gene. Hh
Dominant Trait A trait that appears when a single copy of its gene is inherited.
Recessive Trait A trait that appears only when a copy of the recessive gene form is inherited from each parent.`
Codominance When alleles are both expressed for a phenotype, causing a mixture of the traits. (Tan + Black = Tabby)
Incomplete Dominance When there is a blending of traits and the phenotype is in between the two alleles. (White + Red = Pink)
Why did Mendel study pea plants? They were easy to grow and had many traits to study.
Genes Chunks of DNA that determine individual traits in individuals.
Would a heterozygous genotype (Tt) for height of a pea plant show a dominant or recessive trait? Tall or short? Heterozygous Tt would show the dominant trait and be tall.
Would a homozygous genotype (tt) for height of a pea plant show a dominant or recessive trait? Tall or short? Homozygous tt would show the recessive trait and be short.
What traits of pea plants did Mendel study? Pod color and shape; seed color and shape; height of plant; color of flowers; and seed cover.
DNA Molecules that instruct the building of cells.
Heredity The passing of traits from parents to an offspring.
Created by: cook2sm