Amoeba Sisters Video Recap: Dihybrid Crosses (Mendelian Inheritance) Answer Key
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AMOEBA SISTERS: VIDEO RECAP DIHYBRID CROSSES (MENDELIAN) Amoeba Sisters Video Recap: Dihybrid Crosses (Mendelian Inheritance) Vocabulary practice! You probably have had enough of cats with our video. On to peas! In pea plants, yellow peas (coded for by a dominant allele Y) are dominant to green peas (requiring two recessive alleles y). Round peas (coded for by a dominant allele R) are dominant to wrinkly peas (requiring two recessive r alleles). These are actual pea plant traits, by the way! For the following, please write in the genotype or phenotype. Some are filled in for you. 7. An allele is a form of a gene. In a dihybrid cross HhSs x hhss, how many alleles does a kitten inherit from the mother? _______ 8. How many alleles does a kitten inherit from the father? _______. 9. Gametes, which are sex cells, carry the alleles. Why must a gamete carry one allele (represented by a letter) from each gene? Meaning, why can’t a gamete carry an “hh” instead of an “hs” or an “Hh” instead of a “HS?” The Dihybrid Problem Solve Read the beginning part about pea plants again. Bernard really likes growing peas in his garden, but the peas he likes are green. He also likes them to have a wrinkled texture, because he thinks they look much more interesting that way. Please work out a RrYy x RrYy (heterozygous cross) on the back of this sheet or on another paper while showing all work. 10. After showing your work to use as support, what is the chance that Bernard will have pea plant offspring that match the phenotype he is looking for (green, wrinkled)? _______________________ 11. What is the phenotype ratio of this heterozygous cross? ________(yellow, round): __________(yellow, wrinkled): ___________(green, round) : ___________(green, wrinkled) 12. If Bernard did not receive any pea plants that were green and wrinkled in actuality, would you know for sure that the parent genotypes were incorrect? Why or why not? _________________________________________________________ ____________________________________________________________________________________________________