Part II – Eye Coloration Puzzled, Alexia and Evan used the internet to research what gives the eye its color.
Added by Elizabeth C.
Step 1
Step 1: Understand the basic anatomy of the eye, focusing on the iris, which is the part that determines eye color. Show more…
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Question 1 Assuming blue eyes are a Mendelian recessive trait and using a Punnet square: What is the likelihood of Evan and Alexia having a brown eyed child? 0% 25% 50% It can't be determined Question 2 Assuming that Alexia was unfaithful, what genotype(s) can the potential father have? BB Bb Bb & bb BB & Bb Question 3 What type of protein might the blue/brown color gene affect? The production of melanin in the back of the iris The production of melanin in the front of the iris The proportion of eumelanin to phenomelanin The production collagen in the stroma Question 4 Determine all the possible genotypes (at the OCA2 and gey loci) for Alexia and Evan bG and bg Bg and bg bg BG Question 5 Determine all the possible genotypes (at the OCA2 and gey loci) for Alexia and Evan’s children bbgg, bbGg bbGg BbGg, Bbgg, bbGg, bbgg bbgg Question 6 Are the OCA2 and gey genes genetically linked? Why or why not? No, because they are on different chromosomes Yes, because they are on different chromosomes No, because the OCA2 gene is epistatic to the gey gene Yes, because the OCA2 gene is epistatic to the gey gene
Anand J.
Re-examine your answer to Question 11 and the information learned in the previous section. How similar are the DNA at the associated regions of blue-eyed and brown-eyed people likely to be? Based on this, propose a mechanism that could account for Ryan's eye color. Be as specific as you can in explaining what might have happened. Many genes are known to affect eye color. More than two are known to have an effect. You have already reviewed the effects of OCA2, HERC2, and gey, and your answer to Question 8 may have identified a few more possibilities. These genes work together to affect the quantity, distribution, and quality of the melanin found in the front of the iris. Each must work well for the formation of brown irises. Non-brown eyes result when there is a mutation in any one of these gene products. Do blue-eyed parents always share the same mutation? What if they didn't? How might this account for Ryan's eyes? Do organisms that have identical DNA always share a common phenotype (think of identical twins)? What can account for observed differences in phenotype? How might this play out at the molecular level? How might this apply in Ryan's case?
Supreeta N.
Madhur L.
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