Meiosis & Heredity- Vocabulary

20 terms by lrue

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Study Sesh for the Meiosis Test on 2/17/12

Traits

A characteristic that an organism can pass on to its offspring through its genes

Heredity

The passing of traits from parent to offspring

Genetics

The scientific study of heredity

Genes

A segment of DNA on a chromosome that codes for a specific trait

Alleles

The different forms of a gene

Dominant Allele

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

Recessive Allele

An allele that is masked when a dominant allele is present

Homozygous

Having two identical alleles for a trait

Heterozygous

Having two different alleles for a trait

Probability

The likelihood that a particular event will occur

Punnett Square

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

Phenotype

an organism's physical appearance or visible trait

Genotype

An organism's genetic makeup, or allele combination

Purebred

An organism that always produced offspring with the same form of trait as the parent

Hybrid

An organism that has two different alleles for a trait; An organism that is heterozygous for a trait

Codominance

A condition in which neither two alleles of a gene is dominant or recessive

Chromosome

A double rod of condensed chromatin; contains DNA that carries genetic information

Karyotype

A picture of all the chromosomes in a cell arranged in pairs

Meiosis

The process that occurs in gametes(sperm and egg) by which the number of chromosomes is reduced by 1/2

What is the difference between Meiosis vs. Mitosis

Meiosis- The division of sex cells (Sperm and Egg)
Mitosis- Division of normal cells (Somatic Cells)

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