7th Science Vocab by Alison

22 terms by lvascience

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Heredity

The passing of physical characteristics from parents to offspring

Trait

Each different form of a characteristic, such as stem height or seed color

Genetics

Scientific study of heredity

Fertilization

When a new organism begins to form when egg and sperm cells join together

Purebred

The offspring of many generations that have the same form of a trait

Gene

Factors that control a trait (contains 2 alleles)

Alleles

The different forms of a gene

Dominant Allele

One whose trait always shows up in the organism when the allele is present

Recessive Allele

Hidden whenever the dominant allele is present

Hybrid

An organism that has 2 different alleles for a trait

Probability

A number that describes how likely it is that an event will occur

Punnett Square

Chart that shows all the possible combinations of alleles that can result from a genetic cross

Phenotype

An organism's physical appearance or visible traits

Genotype

An organism's genetic makeup, or allele combinations

Homozygous

An organism that has 2 identical alleles for a trait (purebred)

Heterozygous

An organism that has 2 different alleles for a trait (hybrid)

Codominance

When both alleles for a gene are expressed equally

Incomplete Dominance

When one allele is only partially dominant

Polygenic Inheritance

When more than one gene affects a trait

Inherited Trait

Trait someone is born with

Acquired Trait

Trait that is caused by physical action (environment)

Not born with it

Meiosis

Process by which the number of chromosomes is reduced by half to form sex cells- sperm and eggs

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