Determine whether each family member has a widow's peak or not. Do many relatives have the same type of earlobe or is there variation? Can you see how this trait was inherited? Write down your results in your "Earlobes" family tree. 
(Attached earlobes are clearly attached to the side of the head at the bottom of the earlobe whereas detached ones hang free.) There can be a range of attachment-just do your best to determine how attached the earlobes are.
Determine whether each family member has attached or detached earlobes. Alternatively, you can do this activity with some members separately. Gather the family members together that you put on your family tree. Label each family tree one of the following: "Earlobes," "Widow's Peak," "Mid-Digit Hair" and "Hitchhiker's Thumb.". Make three copies of your family tree (so you have four total). You can look at this resource on “Your Family Health History” ( pdf) for examples of family trees. You can designate the males by a square and the females by a circle. Include all of the family members from whom you will be getting data. Draw a family tree, or pedigree, showing the different members of your family. The more members of the family that are available, the better the results will be. At least three generations of people from the same family. When the heterozygous purple-flowered offspring were crossed with one another, some of their offspring would wind up with two copies of the recessive allele, giving them white flowers. The purple allele was dominant and the white one was recessive. When crossing homozygous purple flowered plants to homozygous white flowered plants, the offspring (which were heterozygous) had purple flowers. For example, Mendel took pea plants that were homozygous for different traits and crossbred them. Other alleles are recessive, meaning you need two copies of that allele to display the trait. Some alleles are dominant, meaning that if you have one copy of that allele you will display that trait. If you have two identical alleles, you are said to be homozygous for that gene whereas if you have two different alleles you're heterozygous. Alleles are differences in the DNA sequence of a gene. Many genes come in different versions, called alleles. This results in two copies of every gene, which is composed of a variety of pairs of DNA. Today we know that offspring inherit their DNA from both parents-half from each. In the 1860s botanist Gregor Mendel discovered that in pea plants some physical features, such as flower color, are passed down in clear and predictable patterns. When we look at members of a family it's easy to see that some physical characteristics, or traits, are shared. You will likely discover some characteristics that you got from your dad's side of the family, and for this Father's Day you can thank him for giving them to you! In this activity you'll get to see how writing some characteristics onto a family tree can help you determine just how you inherited them. The genes contain the secrete of life, that is unraveled only after a baby is born.Has anyone ever told you that you look just like one of your parents or grandparents? Some characteristics, such as the shape of your hairline or whether your earlobes are attached or detached, are inherited. One can never know what traits a baby will inherit from which parent. Whether one wants to or does not want, genes are inherited by default. Every physical, emotional, mental and health trait exhibited by an individual is all due to gene expression. These were some of the dominant and recessive traits in humans. 
Other dominant and recessive traits in humans include: These were just a few dominant and physical traits in humans. This is the reason that more number of men are colorblind as compared to women. In men, there is only one X chromosome and if they carry an allele for color blindness, they will express this trait. There are two X chromosome in women and one of them usually carries an allele for normal vision. The chances of child inheriting allergy from a parent is about 25% and the risk increases if both parents have allergies.Ĭolor blindness is a genetic disorder that is seen due to presence of a recessive allele located on the X chromosome. It is seen that a parent with allergies has a chance that one of four of their children may develop allergy. People with allergies may have inherited the gene for allergy from at least one of the parent.
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