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P. Mehta
Genetics
9
Science
7th Grade
02/10/2010

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Term
Alleles
Definition
The different forms of a gene. Y and y are different alleles of the gene that determines seed color.
Term
Dominant Trait
Definition
A trait expressed preferentially over another trait.
Term
F1 Generation
Definition
Offsprings of a cross between true breeding plants, homozygous for the trait of interest.
Term
F2 Generation
Definition
Offspring of a cross between F1 generation.
Term
Genotype
Definition
The genetic constitution of an organism with respect to a trait. Yellow seeds are dominant, but yellow seeded plants could have a genotype of either YY or Yy.
Term
Heterozygous
Definition
Differing alleles for a trait in an individual, such as Yy.
Term
Homozygous
Definition
Both allels for a trait in an individual. They can be homozygous dominant (YY), or homozygous recessive (yy).
Term
Hybrid
Definition
Heterozygous; usally refering to the offspring of two true-breeding (homozygous) individuals differing in the traits of interest.
Term
Monohybrid Cross
Definition
Cross involving parents differing in only one trait.
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