Genetics: Phenotype and

Genotype

By Table 6

What is a Phenotype?

is any is any observable characteristic observable characteristic or or trait of an of an organism

Phenotypes Phenotypes resultresult from as well as from as well as the the mixture of genes mixture of genes and the and the product of it. product of it.

In Mendelian genetics the dominant trait is the In Mendelian genetics the dominant trait is the phenotype and in this example it is the big B in phenotype and in this example it is the big B in Bb Bb

To better understand it…

What is a genotype?

The The genotypegenotype is the is the genetic constitution constitution of the dominant and of the dominant and resistant resistant (i.e. the (i.e. the specific specific allele makeup of the makeup of the individual) usually individual) usually with reference to a with reference to a specific character specific character under consideration under consideration

Science Vocabulary!

Allele- (from the greek word allelos meaning each other) is one of two or more forms of the DNA sequence of a particular gene.

Homozygous- having 2 identical alleles of a particular gene

Heterozygous (a.k.a. hybrids)- having 2 different alleles of a particular gene

In a few words it is…

Genotype is the Genotype is the inherited gene inherited gene combination combination

It is like a It is like a messagemessage in the genes in the genes

Genetic make-up Genetic make-up of an organismof an organism

So do we now know how to differentiate Phenotype and Genotype?

Geno or Pheno?

The flowers are purple

OROR

PhenotypePhenotype

GenotypeGenotype

Geno or Pheno?

Genetic Code: Pp

Or Or

GenotypeGenotype

PhenotypePhenotype

Let’s make it a little

harder…

If Katniss’ genetic If Katniss’ genetic code is Gb, that would code is Gb, that would mean the phenotype mean the phenotype

would be ________would be ________Legend:

B is for blue eyes

G is for grey eyes

Grey EyesGrey EyesBlue EyesBlue Eyes Blue-Grey

Eyes Blue-Grey

Eyes

If Peeta’s genetic code is BB that would mean the

phenotype would be ________

Legend:

B is for blue eyes

G is for grey eyes Blue EyesBlue EyesBlue-Grey Eyes

Blue-Grey Eyes Grey EyesGrey Eyes

The HARD questions

Josh is homozygous for night blindness. Josh is homozygous for night blindness. What is his genotype? ___________What is his genotype? ___________

Scarlet is heterozygous for night Scarlet is heterozygous for night blindness. What is her genotype?blindness. What is her genotype?____________ Is she night blind?____________ Is she night blind?___________. ___________.

Well Done!

Remember the differences between Remember the differences between phenotype and genotype.phenotype and genotype.

CLICK HERE TO GO BACK TO SCIENCE CLASS CLICK HERE TO GO BACK TO SCIENCE CLASS

Study Harder!

Go back Go back