Download Human Traits - Henriksen Science

Human Traits Survey
Name_______________
CB
33
Let’s look at some of the traits that people have. You need to complete the survey for
yourself and ALSO for 2 other people that do not take my class. If possible, these 2
people should be related to you, however, you can also choose unrelated family,
teachers, or friends. You will need a ruler. You will need a ruler.
Traits measured in centimeters:
Trait
Hand span – distance from
tip of pinkie to tip of thumb
when hand is fully stretched
Self
1:
2:
Phenotype Phenotype Phenotype
A result of multiple genes so
genotype cannot be
determined from phenotype.
Reaction time –
number of centimeters
that passes before you
can catch a falling ruler
(best out of 3)
Phenotype Phenotype Phenotype
A result of multiple genes
so genotype cannot be
determined from
phenotype.
Yes or no/Multiple choice traits:
Trait
Eye color – what color are your eyes?
A result of multiple alleles and maybe many genes.
Blue is said to be recessive.
Freckles – do you have freckles? Say “yes” only if
you have LOTS of freckles all over your nose and
cheeks. Sun freckles do not count.
Self
Check the
phenotype:
 brown
 blue
 green
 hazel
Phenotype:
1:
Check the
phenotype:
 brown
 blue
 green
 hazel
Phenotype:
2:
Check the
phenotype:
 brown
 blue
 green
 hazel
Phenotype:
Possible
Possible
Possible
Genotype(s): Genotype(s): Genotype(s):
Freckles are dominant so if a person has freckles we know
they have genotype FF or Ff. No freckles would be ff.
PTC tasting – can you taste the bitter PTC on the
paper strip? A “taster” will without doubt know they
can taste the bitter compound
Tasting is a dominant trait.
Phenotype:
Phenotype:
Phenotype:
Possible
Possible
Possible
Genotype(s): Genotype(s): Genotype(s):
Tongue rolling - can you roll your
tongue into a tube?
Phenotype:
 yes  no
Possible
Genotype(s):
Phenotype:
 yes  no
Possible
Genotype(s):
Phenotype:
 yes  no
Possible
Genotype(s):
Dimples are dominant.
Phenotype:
 yes  no
Possible
Genotype(s):
Phenotype:
 yes  no
Possible
Genotype(s):
Phenotype:
 yes  no
Possible
Genotype(s):
Earlobe attachment – are
your earlobes attached to the
side of your face?
Phenotype:
 attached
 free
Phenotype:
 attached
 free
Phenotype:
 attached
 free
Attached are recessive and
free are dominant.
Possible
Possible
Possible
Genotype(s): Genotype(s): Genotype(s):
Widow’s peak – do you have
a widow’s peak (hairline has a
V)?
Phenotype:
 yes  no
Possible
Genotype(s):
Phenotype:
 yes  no
Possible
Genotype(s):
Phenotype:
 yes  no
Possible
Genotype(s):
Phenotype:
 yes  no
Possible
Genotype(s):
Phenotype:
 yes  no
Possible
Genotype(s):
Phenotype:
 yes  no
Possible
Genotype(s):
Phenotype:
 normal
 hitchhiker
Possible
Genotype(s):
Phenotype:
 normal
 hitchhiker
Possible
Genotype(s):
Phenotype:
 normal
 hitchhiker
Possible
Genotype(s):
Handedness – are you right or left handed?
For this activity assume right handed is dominant.
Phenotype:
 right
 left
Possible
Genotype(s):
Phenotype:
 right
 left
Possible
Genotype(s):
Phenotype:
 right
 left
Possible
Genotype(s):
Color blindness- are you color blind?
This trait is on the x chromosome so it is more likely
that a male will have this trait. We will discuss this
more later.
Hair color – what color is your hair?
 yes
 no
 yes
 no
 yes
 no








 black
 brown
 blond
 red
Tongue rolling is dominant!
Dimples – do you have
dimples on your cheeks?
Widow’s peak is dominant.
Cleft chin – do you have a
cleft chin?
Cleft chin is dominant.
Hitchhiker’s thumb - can
you extend the top of the
thumb backwards nearly 90°?
Normal thumb is domiant.
Normal
Hitchhiker
A result of multiple genes so genotype cannot be
determined from phenotype.
black
brown
blond
red
black
brown
blond
red
Polygenetic and Monogenetic Traits
What does it mean to be polygenetic? Write your answer and illustrate it with a
drawing!
What does it mean to be monogenetic? Write your answer and illustrate it with a
drawing!
Which traits that we examined seem to be polygenetic?
Which traits that we examined seem to be monogenetic?
Trait Frequencies
Trait
PTC tasting – can you taste the
PTC on the paper?
Freckles – do you have freckles?
Say “yes” only if you have LOTS of
freckles all over your nose and
cheeks. Sun freckles do not count.
Tongue rolling - can you roll
your tongue into a tube?
Dominant
Phenotype
“Yes”
Class
total
# in
sample
pool
Frequency
in class
Trait
Dominant
Phenotype
“Yes”
Class
total
# in
sample
pool
Frequency
in class
Dimples – do you have dimples
on your cheeks?
Earlobe attachment – are your
earlobes attached to the side of
your face?
Widow’s peak – do you have a
widow’s peak (hairline has a V)?
Cleft chin – do you have a cleft
chin?
Hitchhiker’s thumb - can you
extend the top of the thumb
backwards nearly 90°?
Handedness – are you right or
left handed?
Color blindness- are you color
blind?
Look back at the dominant and recessive phenotypes and compare them to the
frequencies we saw in class. Is the dominant gene always the most common?
Explain and use evidence to support your answer.