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Genetics
J. Ankrum
13
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 determins seed color
Term
Dominant trait
Definition
a trait expressed preferentially over anoter trait
Term
F1 Generation
Definition
offspring of a cross between true breeding plants, homozygous for the trait of interest
Term
F2 Generation
Definition
offspring of a cross involving the F1 generation
Term
Genotype
Definition
the genetic constitution of an organism with respect to a trait, yellow seeds are dominate, but yellow seeded plants could have a genotyoe of either YY or Yy
Term
heterozygous
Definition
differing alleles for a trait in an individual such as Yy
Term
Homozygous
Definition
both alleles for a trait are the same in an individual, they can be homozygous dominant or homozygous recessive
Term
Hybrid
Definition
heterozygous usually referring to the offspring of two true-breeding individuals differing in the traits of interest
Term
Monohybrid cross
Definition
cross involving parents differing in only one trait
Term
Mutation
Definition
change in the DNA sequence of a gene to some new, heritable form, generally but not always recessive allele
Term
Phenotype
Definition
the physical appearance of an organism with respect to a trait
Term
Recessive trait
Definition
the opposite of dominant, a trait that is preferentiall masked
Term
Sex-link
Definition
a gene coded on a sex chromosome,such as the X-chromosome linked genes of flies and man
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