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7th Grade Genetics

7th Grade Genetics Test

QuestionAnswer
Allele alternate form of the same gene.
Carrier an individual that carries one gene for a recessive trait. A carrier does not express that trait, but when mated with another can produce offspring that do.
Chromosome a thread-like strand in the nucleus that controls the cell activity and carries the genetic material to pass traits to offspring.
Co-dominant 2 alleles of a gene pair in a heterozygote that are both fully expressed.
Dominant Gene strong form a a gene, which is expressed even if a recessive gene is present.
Gamete sex cell
Gene a unit of genetic material that determines a trait.
Genetics the scietific study of genes/inheritance.
Heredity the pasing of physical characteristics from parent to child.
Heterozygous having 2 different alleles for a trait. (also known as hybrid)
Homozygous having 2 of the same alleles. (also known as pure bred)
Hybrid having 2 different alleles for a trait (also know as heterozygous)
Incomplete Dominance a condition tht results when genes produce a trait somewhere in between the traits of the parents.
Inherit to acquire a triat from your parents
Karyotype a picture of a person's chromosomes
Meiosis cell division that happens in sex cells only. produces gametes have one set of unpaired chromosomes.
Gregor Mendel Austrian monk who studies pea plants and figured out the rules of heredity. The "father" of genetics.
Mutation a change in DNA or chromosomes
Pedigree a line of anchstors; visual representation.
Phenotype The actual characteristics that an organism demonstrates
Polygenic a trait that requires more than one gene
Probability The percent chance of inheriting a trait
Punnet Square a visual diagram that demonstrates the possible genotypes person could inherit from the parents.
Pure bred having 2 of the same alleles. (also known as homozygous)
Ratio relation in degree or number between two different things
Recessive Gene the weak form of a gene, which is not expressed when the dominant form is also present.
Sex-linked trait A recessive trait carried on the X chromosome.
Trait genetically determined characteristic
Created by: memsoccer1013 on 2006-03-28



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