Genotype and Phenotype + Dominant and Recessive Review

Genotype and Phenotype Review

DOMINANT TRAIT

* The trait that first appears or is visibly expressed in an organism.

Examples: dark hair, freckles, dimples

* The example shows capital A, capital letters are always Dominant over lower case a letters.

Examples: AA, Aa, or aa

RECESSIVE TRAIT

* Is present at the gene level but is masked and does not show itself in the organism.

* The example shows the two children on the left inherited the dominant trait T (taster) from their parents. 

* The child on the right inherited the recessive trait tt (non-taster) from both parents  

Multiple Choice

Dominant genotypes are written with:

• Uppercase Always

• Lowercase Always

Multiple Choice

Recessive genotypes are written with:

• Uppercase Always

• Lowercase Always

GENOTYPE

* The entire set of genes found in an organism’s cells

* Geno – refers to genes

The Genotype are expressed in letters, capital letter for the dominant trait, lower case for the recessive trait.

G =Green Bean

g = Yellow Bean

PHENOTYPE

* Is an organism’s observable or expressed characteristics.

* Pheno – refers to physical attributes

* Example: the flamingo is pink with a long neck

Multiple Choice

Round (R) seed is dominant to wrinkled (r) seed.

RR, Rr, or rr is an example of a

• genotype

• phenotype

Multiple Choice

Round (R) seed is dominant to wrinkled (r) seed.

Round seed

Wrinkled seed

What are these examples of?

• genotype

• phenotype