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5. Choose another trait and genotype, and make another Punnett square. ratio of genotypes: ratio of phenotypes: ояти Activity #3 on Albinism: DOOMED CORN. DOOMED CORN. Albinism occurs in many species of animals, and in plants. For the animals, the condition may be an inconvenience, but for the plants it can be a death sentence. Consider that the green pigment, chlorophyll, is necessary for plants to produce food by photosynthesis. Without chlorophyll, the plants soon starve to death, so a mutation in the gene for the enzyme that produces chlorophyll is deadly to plants. mu odt greu Enzyme or boost Precursor → Chlorophyll JBTT INSTRUCTIONS. Observe the newly sprouted corn seedlings and fill in Table 2. Table 2. Corn Seedlings. TRAIT NUMBER OF SEEDLINGS GENOTYPE(S) (Pair of letters) Normal Green Pigmentation Albino (No Pigmentation) Questions on Albinism: Doomed Corn. 1. What phenotypic ratio do you observe in the offspring? 2. Can you predict the phenotypes of the parents of these offspring? (Hint: albino plants don't survive long enough to make seeds) Rev. Aug 2013 Biology 21

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Question on Autosomal Human Variations. 1. If a person has a straight hair line, what is (are) their phenotype? genotype(s)? If a person has a widow's peak hair line, what is (are) their phenotype? genotype(s)? widow peak phenotype, WW or Ww straight hair line phenotype, ww Activity #2 on Autosomal Human Variations: PREDICTING YOUR BABIES. INSTRUCTIONS. Select a "mate" (of either sex) from your classmates. PROCEDURE: To investigate how you might pass a gene to a child: 1. Enter your genotype and your mate's genotype in the appropriate spaces below for any dominant/recessive trait in Table 1 (for example: genotypes = Ll, mm, or RR). 2. When a person has two possible genotypes, choose one of them for this exercise. 3. Determine what gametes you each can make. Gametes are haploid (a, not aa). 4. Using the Punnett square, predict the genotypes and phenotypes of your children. You may record the results as ratios (e.g. 3:1) or as % probabilities (c.g. 75%, 25%). Traiteye colour (Bb Your genotype (bb) Mate's genotype Β) b bb Your gametes Mate's gametes Punnett Square: Punnet Square: b b B Bb Bb ratio of genotypes: 2:2 black black bb bb ratio of phenotypes: 2:2 brown brown

presence of freckles 5. Choose another trait and genotyne, and make another Punnett square. om ratio of genotypes: 1:2:1 FF Ff present present present absent ratio of phenotypes: 3:1 ояти DO19

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