Instructions: Study all the visual information in this online lab, plus the accompanying explanations. Be prepared to answer a few "check-in" questions to show that you were paying attention. |
Dominant trait | Recessive trait | ||||||||
Brown eyes | Blue eyes
"Widow's peak" (front of hairline comes | to a point over forehead) Straight hairline
| Brachydactyly (abnormally short fingers)
| Normal fingers
| "Taster" of PhenylThioCarbamide (PTC)
| "Non-taster" of PTC
| Straight thumb
| "Hitchhiker's thumb" | |
SAMPLE PROBLEMS: Work out each of these problems on a blank sheet of paper. List female gametes across the top (column headings) and male gametes down the left side (row headings). These are good practice, but there is no need to hand in your answers.
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BLOOD TYPE | Antigens | Antibodies | Can give blood to: | Can receive blood from: | Possible genotypes: |
A | A | anti-B | A or AB | A or O | AA, Ao |
B | B | anti-A | B or AB | B or O | BB, Bo |
AB | A and B | neither | AB only | any type | AB |
O | neither | anti-A, anti-B | any type | O only | oo |
MORE PROBLEMS:
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