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Chapter 3
page 74-90 lessons 1,2,3,4
20
Science
7th Grade
05/16/2013

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Term

-Heredity

 

 

Definition

+ The passing of physical characteristics from

parents to offspring.

Term
-Trait
Definition
+ Each secific characteristic such as stem height, or seed color.
Term
-Genetics
Definition
+ The scientific study of  heredity.
Term
-Fertlization
Definition
+  When egg and sperm cells join.
Term
- purebred
Definition

+ The offspring of many generations with

the same form of a trait

Term
- Gene
Definition
+ The factors that control a trait.
Term
- Alles
Definition
+ The different forms of a gene.
Term
- Dominant allele
Definition
+ one whose trait always shows up in the organism the allele is present.
Term
- Ressesive allele
Definition
+ One who is hidden when the dominant allele is present.
Term
- Probability
Definition
+ The outome of an event like flipping a coin, you will either get heads or tails, so you have a 1/2 chance of landing on tails and 1/2 chance of landing on heads.
Term
- Punnet square
Definition
+ a chart that shows all possible ways alleles can combine in a genetic cross.
Term
- Phenotype
Definition
+ The physical appearence or visible traits in an organism.
Term
- Genotype
Definition
+ The genetic makeup or alleles of an organism.
Term
- Homozygous
Definition
+ An organism with two identical alleles for a trait.
Term
- Heterozygous
Definition
+ An organism with two different alleles for a trait.
Term
- Incomplete dominance
Definition
+ An event that occurs when one allele is only partially dominant.
Term
- Codominance
Definition
+ An event that occurs when both alleles for a gene are expressed equally.
Term
- Multiple alleles
Definition
+ Three or more possible alleles determine the trait.
Term
- Polygenic inheritence
Definition
+ An event that occurs when more that one gene affects a trait.
Term
- Meiosis
Definition
+ The process by which the number of chromosomes is reduced by half as sex cells form.
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