1. 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

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

3. 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

4. 1 2 3 5 6 4 7 7 8 9

5. 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

6. 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

7. 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