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SI Worksheet #15 (Chapter 14) BY 123Meeting 10/29/2015Chapter 14: Mendel and the Gene IdeaWhat is the difference between a character and a trait? Give some examples of each.What is a true breeding plant?What is hybridization? What genotype is produced?What is meant when saying an organism is heterozygous for a gene? What is meant when saying an organism is homozygous for a gene? What is the difference between a genotype and a phenotype? What was the genotypic ratio of the F1 generation in Mendel’s experiment with the pea plants? What was the phenotypic ratio of the F1 generation in Mendel’s experiment? What was the genotypic ratio of the F2 generation in Mendel’s experiment with the pea plants? What was the phenotypic ratio of the F2 generation in Mendel’s experiment? What do you call alternate versions of a gene?Discuss the four related concepts that make up Mendel’s Model. A pea plant heterozygous for inflated pods (Ii) is crossed with a plant homozygous for constricted pods (ii). Draw a Punnett Square for this cross. Assume pollen comes from the ii plant. Pea plants heterozygous for flower position and stem length (AaTt) are allowed to self-pollinate and 400 of the resulting seeds are planted. Draw a Punnett Square for this cross. How many offspring would be predicted to have terminal flowers and be dwarf?For any gene with a dominant allele C and recessive allele c, what proportions of the offspring from a CC x Cc cross are expected to be homozygous recessive, and heterozygous?In Mendel’s classic pea crosses, the F1 offspring always looked like one of the two parental varieties. What is the explanation for this phenomenon? (Hint: think about the genotype)When red snapdragons are crossed with white ones, the F1 hybrids have pink flowers. What is this called? What is the genotypic ratio of the F2 generation? What is the phenotypic ratio? Individuals homozygous for the M allele (MM) have red blood cells with only M molecules; individuals homozygous for the N allele (NN) have red blood cells with only N molecules; individuals heterozygous for the M and N alleles (MN) have red blood cells with M and N molecules. What is the reason for this?Why does the heterozygote condition of Tay-Sachs disease not lead to disease symptoms? True or false. Dominant allele for a particular character is more common than recessive allele for a particular character in a population? The ABO blood groups in humans are determined by 3 alleles of a single gene: IA, IB, and i. What is this called? What does the A, B, or O refer to? Which blood group is the universal donor? How many blood groups (phenotypes) are there? What are these blood groups and what are the genotypes associated with each phenotype? Use the table provided below. GenotypeRed blood cell appearance Phenotype (blood group)What is pleiotropy? _________________________ is when a gene at one locus alters the phenotypic expression of a gene at a second locus. Give an example. Skin color in humans varies along a continuum and is an additive effect controlled by at least three separately inherited genes. What is this called? What is the name given to characters that vary along a continuum (in gradations)What is meant by characters being multifactorial? What is this figure? Why is it used? Who are the males and who are the females? Who is affected and who is not affected? Widow’s peak is a dominant allele (W). Fill in the genotype for each family member. 179070015557500 ................
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