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Human Traits The Physical Aspect. Santiago Callejas Cherish Centeno Romina Chanduvi Aileen Perez. Abstract.

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human traits the physical aspect

Human Traits The Physical Aspect

Santiago Callejas

Cherish Centeno

Romina Chanduvi

Aileen Perez


Since, dominant traits have “supremacy” over recessive traits, we have created and conducted surveys that establishes whether dominant traits are more common than recessive traits in the Miami-Dade College Wolfson Campus student population.


If dominant traits prevail over recessive traits, then dominant traits should be more “commonly” found in Miami Dade’s College student population.

observation research overview
  • Researched:
  • What are human traits?
  • Where do they come from?
  • Mendelian Genetics
  • Dominant VS Recessive
  • Sex linked traits
  • “Shuffling the deck”
  • Types of inherited human traits
what are human physical traits
What Are Human Physical Traits?

The genetically determined characteristic or condition of an individual.

These characteristics are controlled by one or more genes.

Most genes have two or more variations, called alleles. For instance, the gene for hairline shape has two alleles – widow’s peak or straight. An individual may inherit two identical or two different alleles.

The eye color gene, also has more than one variation.

Straight Hairline Widow’s Peak


where do they come from
Where Do They Come From?
  • Physical traits that are observable characteristics determined by specific segments of DNA called genes. Multiple genes are grouped together to form chromosomes, which reside in the nucleus of the cell.
  • Every cell (except eggs and sperm) in an individual's
  • body contains two copies of each gene. This is due
  • to the fact that both mother and father contribute a
  • copy at the time of conception.
  • This original genetic material is copied each time a cell divides so that all cells contain
  • the same DNA. Genes store the information needed for the cell to assemble
  • proteins, which eventually yield specific physical traits.
mendelian genetics
Mendelian Genetics

Mendel studied traits & how they are passed on to offspring

  • He established 2 possible "alleles" for each trait. The combination was (1 from mom, 1 from dad) which is called your "genotype"
  • There are more than 2 alleles for some traits. Most traits, in fact, are affected by more than 1 gene

Gregor Mendel (1822-1884)

dominant vs recessive
Dominant VS Recessive

Recessive Gene:

is expressed only when two copies of the gene are present

2 Matching Allele

-In homozygous individuals, The allele that is expressed is either the “recessive” allele or the “dominant” allele.

Dominant Gene:

is expressed in a person who has only one copy of that gene

2 Different Allele

-In heterozygous individuals, the allele that is expressed is the “dominant” allele.

sex linked traits gregor mendel
Sex-Linked TraitsGregor Mendel

In the case of genes located on the X chromosome, females would have the usual 2 alleles for each gene but males only have 1 X chromosome and thus 1 allele (the Y chromosome contains only a small number of genes related to gender)

shuffling the deck gregor mendel
Shuffling the Deck(Gregor Mendel)

Chromosomes of offspring don’t have a half that’s clearly from dad and a half that's from mom. During duplication there is "crossing over" of bits of each half.

who was surveyed
Who was surveyed?

Recessive Traits

-Straight hairline

-No dimples

-Attached Earlobe

-No roller

-hitch-hikers thumb

Miami- Dade Wolfson Campus

Determining Factors: Race, gender and writing hand

Dominant Traits

-Window’s peak hairline


-Free ear lobe


-Straight thumb

thumb trait
Thumb Trait




Results show that our hypothesis was indeed correct. They are more people within the population who express dominant traits rather than recessive traits. However, our studies also revealed that there are many among the population that display recessive traits.


1. Name a leading recessive trait found in the Miami-Dade student population.

  • Freckles
  • Dimples
  • Tongue roller
  • Attached earlobe

2. Is tongue rolling a dominant or recessive trait?

3. Who is going to get an A for the presentation

  • Human traits group
  • Human traits group
  • Human traits group
  • Human trait group