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Genetics
Genetics unit
17
Science
7th Grade
10/17/2007

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Cards

Term
genetics
Definition
  • the study of heredity
  • the passing on of traits from an organism to its offspring
Term
pollination
Definition
  • when pollen lands on top of the pistil of a flower
  • pollination produces seeds for the next generation
Term

fertilization

Definition
union of egg and sperm
Term

P-generation

Definition
  • the first generation
  • the Parent generation
Term
F1-generation
Definition
  • the offspring of the P-generation
  • First Filial
Term
F2-generation
Definition

the offspring of the F1-generation

Term
dominant
Definition
  • the expressed trait
  • the trait that is known or visible
Term
recessive
Definition
  • the unexpressed trait
  • the trait that seems to disappear
Term
incomplete dominance
Definition
  • when genes are neither dominant or recessive
  • neither gene in a gene pair masks the other
  • the traits carried by the two genes appear to be blended
  • alson known as co-dominance
Term
phenotypes
Definition
  • physical appearances
  • visible characteristics
  • the traits that we see
Term
genotypes
Definition
  • the actual gene makeup of an organism

Example:  Bb

Term

purebred

Definition
  • an organism that has genes that are alike for a particular trait

Examples:  YY or yy

Term
hybrid
Definition
  • an organism that has genes that are different for a specific trait

Example:  Yy

Term
Sex Cells
Definition
Determine the sex of the offspring
Term

mitosis

Definition
a cell process in which a cell makes 2 exact copies of itself----the same DNA
Term
meiosis
Definition

a process in which sex cells are produced

 

 

Term
genes
Definition
  • units of heredity
  • segments of DNA on chromosomes
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