Biology chapter 11 : Genetics

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1

Monohybrid cross

Cross involving a single trait e.g. flower color.

2

Dihybrid cross

Cross involving two traits e.g. flower color & plant height.

3

Genes

Chemical factors that determine traits.

4

Alleles

different forms of a gene (dominant or recessive)

5

Dominant

Stranger of two genes expressed in the hybrid; represented by a capital letter (R)

6

Recessive

gene that shows up less after in a cross; represented by a lowercase letter.

7

Genotype

gene combination for a trait. (RR,Rr,rr)

8

Phenotype

The physical feature resulting from a genptype (red, white)

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Probability

the likelihood that particular event will occur.

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Trait

any characteristic that can be passed from parent to offspring.

11

Heredity

passing of traits from parent to offspring.

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Genetics

the study of heredity.

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Law of Segregation

During the formation of egg & sperm, the two alleles responsible for a trait seprate from each other Allesless are re-combined at fertilization producing the genotype.

14

Law of Dominance

In a cross where the parents are pure for trait, only one form of the all the offspring will heterozygous and express only dominant trait.


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