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Download Genetics: Phenotype and Genotype - science 6
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Transcript
What is a Phenotype? is any observable characteristic or trait of an organism Phenotypes result from as well as the mixture of genes and the product of it. To better understand it… In Mendelian genetics the dominant trait is the phenotype and in this example it is the big B in Bb 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 What is a genotype? The genotype is the genetic constitution of the dominant and resistant (i.e. the specific allele makeup of the individual) usually with reference to a specific character under consideration In a few words it is… Genotype is the inherited gene combination It is like a message in the genes Genetic make-up of an organism So do we now know how to differentiate Phenotype and Genotype? Geno or Pheno? The flowers are purple Phenotype OR Genotype Geno or Pheno? Genetic Code: Pp Genotype Or Phenotype Let’s make it a little harder… Legend: B is for blue eyes G is for grey eyes If Katniss’ genetic code is Gb, that would mean the phenotype would be ________ Blue Eyes Blue-Grey Eyes Grey Eyes Legend: B is for blue eyes G is for grey eyes If Peeta’s genetic code is BB that would mean the phenotype would be ________ Blue-Grey Eyes Blue Eyes Grey Eyes The HARD questions Josh is homozygous for night blindness. What is his genotype? ___________ Scarlet is heterozygous for night blindness. What is her genotype?____________ Is she night blind?___________. Well Done! Remember the differences between phenotype and genotype. THE END CLICK HERE TO GO BACK TO SCIENCE CLASS Go back
