Essay on Bio 156 lab 7 genetics

915 Words Jul 28th, 2015 4 Pages
1. List whether the student was positive or negative for each characteristic and include whether the characteristic is dominant or recessive. (6 points)
a. Blood type- O
b. Widow's peak- Negative, resessive.
c. Free ear lobes- Positive, dominant.
d. Tongue rolling- Positive, dominant.
e. Hitchhiker's thumb- Negative, dominant.
f. Left thumb dominance- Negative, reseesive.
g. Little finger bend- Positive, dominant.
h. PTC taster- Negative, resessive.
i. Mid-digit hair- Negative, recessive.
j. Facial dimples- positive,dominant.
k. Freckles- Positive, dominant.
l. Cleft chin- negative, resseive.
2. Can the student tell from the blood type if the student is heterozygous or homozygous? Explain. (5 points) Yes, knowing your blood type would
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What was the result of the student's karyotype? (Include the sex and the chromosomal disorder, if applicable. If there was no chromosomal disorder, the student must state that the individual was normal.) (5 points) Normal 22 year old female 46XX
6. Give an example of a situation in which it is important to create a karyotype for an individual. Explain. (5 points) A situation in which it would be important is if either future parents have a genetic disorder that could be passed down to their offspring.
7. Genetically speaking, why is it important not to mate with a close relative? Explain. (5 points) It is so important because mixing such similar DNA cause a variety of genetic disorders and deformities that will be only affect the offspring negatively, but also the future generations stemming from them.
8. Does a karyotype tell all of a person's genetic characteristics? Explain. (5 points)
While karyotypes do reveal if you are missing or have extra chromosomes, it cannot display genetic disorders.

9. Why is a photograph of cells in metaphase utilized when constructing a karyotype? (5 points) It is utilized because it provides a great view of metaphase which allows you to study the traits that are forming.

10. What does it mean to be a carrier of a genetic defective characteristic? When might it be important to know if one is a carrier? (5 points) Being a carrier of a genetic defective characteristic indicates that you have the ability to pass that on to

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