Inquiry into Genetics # 1 Trait Alleles Genotype Phenotype Hazel Green Name __________________ Period ___ Date ________ Inquiry into Genetics Trait Alleles Genotype Phenotype Black, brown Red, Blond HH Hh hh Brown Blond(e) Hair color Brown Blue EE Ee ee Eye color Brown Hazel Green blue

Inquiry into Genetics # Trait Alleles Dominant Recessive Genotypes Phenotypes 1 _______ ( __ ) _____ _________________ 2 3 4 5 6 7 8 2

HH - Homozygous Dominant Hh - Heterozygous hh - Homozygous Recessive Trait Alleles Dom/Rec Genotype Phenotype Black brown Red Blond HH Hh hh Brown Blond(e) Hair color Brown Blue Brown Hazel Green blue EE Ee ee Eye color

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Genes – are located on chromosomes, instructions for traits/characteristics Trait - a distinguishing characteristic (hair color) Alleles - are the different forms of a gene trait (Brown, Blonde, Black, Red) Alleles are either: Dominant (capital letter) Recessive (lower-case letter) We have 2 alleles for each gene trait – why? Genotype: Homozygous Dominant: TT Heterozygous: Hh Homozygous Recessive: ee Phenotype: Hair color? Eye color? Tongue Roll? Gene loci Gene locus

Check for Understanding Trait - a distinguishing characteristic Alleles - the different forms of a gene trait Is it an allele or a trait? a. Blue eyes b. Height c. Skin tone d. Dimples? e. Attached or detached lobes f. Hair texture g. Right-handed h. Flat feet i. Tongue Rolling? Gene loci Gene locus

Karyotype – a profile of a person’s chromosomes, organized by scientists Matching homologous pairs by size (largest to smallest), shape, centromere location, & gene band patterns. Enables scientists quick spotting of chromosomal abnormalities. 1. Arranged in ___________________ 2. Chromosomes #1 – 22 are called ____________ chromosomes. 3. Chromosomes #23 are called _______ chromosomes For males: __ __, Females: __ __ 4. How many total chromosomes in humans? ____ or ___ pairs. Pairs (1 - 23) autosomal sex X Y X X 46 23 http://learn.genetics.utah.edu/content/begin/traits/karyotype/