Transcription of Name Date Period Use the chart to identify the genotypes ...
1 Name Date Period Use the chart to identify the genotypes of the following traits: 1. Heterozygous round eyes, blue body Rryy 2. Hybrid eye shape, purebred roundpants Rrpp 3. Purebred roundpants, heterozygous long nose ppLl SpongeBob s aunt, who is a roundpants, has a cute stubby nose. She has finally found the sponge of her dreams and is ready to settle down. Her fianc always comments on how adorable her nose is (he says it reminds him of his mother s aww, how sweet!). They wonder what the chances are of that trait being passed on.
2 Her fianc is a purebred squarepants and has purebred long nose. 4. identify the genotypes of the aunt and her fianc . Aunt Roundpants, Stubby Nose = ppll Fianc Purebred Squarepants, Long Nose = PPLl (has to be heterozygous Ll because his mom has as stubby nose) 5. What are the possible gamete combinations for each person? Aunt pl only Fianc Pl or PL 6. What are the possible genotypes for their children? Ppll or PpLl 7. What are the genotypes of SpongeBob, who is heterozygous for his yellow body color and his squarepants, and his wife SpongeSusie, who is blue and has roundpants?
3 SpongeBob = YyPp SpongeSusie = yypp 8. What are the possible gamete combinations for each person? SpongeBob = YP Yp yP yp SpongeSusie = yp 9. Complete the Punnett square based on the information provided in #7-8 and then answer the questions. What is the chance of a blue baby? 50% or What is the chance of a squarepants? 50% or What is the chance of a blue squarepants? 25% or What is the chance of a purebred recessive for both traits? 25% or 10. In starfish, pink body color (P) is dominant to orange (p), and thick eyebrows (T) are dominant over thin (t) ones.
4 Patrick, who is heterozygous for body color but purebred for thick eyebrows, has met Patti, who is recessive for both traits. What is Patti s phenotype?pptt Is it possible for the new couple to have offspring that resemble their mother? Explain. It is possible for them to resemble their mother in color (half of them would be orange) but not in eyebrows. None of them would look just like their mother. 11. Before Patrick commits to this relationship, he would like to guarantee that his offspring would have his thick eyebrows.
5 (He thinks they make him smarter!) You need to provide evidence for or against the marriage. This question regards eyebrows ONLY. Because Patrick is homozygous dominant for eyebrows, all of his offspring will have thick eyebrows regardless of who the mother is. yp YP YyPp Yp Yypp yP yyPp yp yypp 12. While Squidward s family boasts about being a purebred line for dominant light blue skin color, they are also purebred for a less distinguished trait: the recessive trait of baldness. Lack of hair causes Squidward some self-esteem issues that he does not want his children to face.
6 He would like to ensure that his offspring have hair AND his blue skin color. What traits should he look for in a bride? Must she have hair? Explain She must have hair to pass that trait down to the offspring. To ensure all of his offspring have hair she must be homozygous dominant for that trait. Must she be blue? Explain. She does not need to be blue, because Squidward will pass down the blue trait to all of his offspring. 13. Squidward has found a potential bride prospect with the green squid Octavia.
7 While Octavia has hair, her father does not. Determine the chances of their child being blue and having hair. Squidward = BBhh Octavia = bbHh 14. Use the genotypes in #13 to complete the Punnett square below and then answer the questions. Bh bH BbHh bh Bbhh For which traits, if any, is it possible for their offspring to be purebred It is possible for their offspring to be purebred bald. What is the probability of their children being heterozygous for both traits? 50% or 15. After spending some time with Octavia, Squidward decides that she is not his perfect match and much prefers her sister, Olivia.
8 Olivia also has hair, but unlike her sister she has blue skin. Unfortunately she also has very bushy eyebrows that Squidward does not want his children to have. His mother has bushy eyebrows and Squidward thinks they make her dumber (much like Patrick s make him dumber.) Luckily in squid, bushy eyebrows are recessive to lack of eyebrows. What are the parental genotypes for all three traits? Squidward = BBhhEe Olivia = BbHhee What are the chances that their offspring will be blue, with no eyebrows?
9 50% of their offspring will be blue with no eyebrows Be be BE BBEe BbEe Be BBee Bbee What are the chances their offspring will be green? None of their offspring will be green! What are the chances that their offspring will be bald, but still have bushy eyebrows? or 25% of the offspring would be both bald and have bushy eyebrows. He he hE HhEe hhEe he Hhee hhee
