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- Variations on a Theme by Mendel A characteristic of snapdragons amenable to genetic analysis is flower color. Imagine that a true-breeding red- flowered variety is crossed to a pure line having white flowers. The progeny are exclusively pink-flowered. Diagram this cross, including genotypes for all P1 and F1 phenotypes. What is the mode of inheritance? Let F = red and f = white.The text outlines some of the problems Frederick William I encountered in his attempt to breed tall Potsdam Guards. a. Why were the results he obtained so different from those obtained by Mendel with short and tall pea plants? b. Why were most of the children shorter than their tall parents?Francis Galton, a geneticist of the pre-Mendelian era, devised the principle that half of our genetic makeup is derived from each parent, one-quarter from each grandparent, one-eighth from each great-grandparent, and soforth. Was he right? Explai
- A woman who is heterozygous, Bb, has brown eyes; B (brown) isthe dominant allele, and b (blue) is recessive. One of her eyes,however, has a patch of blue color. Give three different explanationsfor how this might have occurred?Mendel’s experiments relied on VERY specific properties of pea plants in order to achieve the results. I) What were the properties of his pea plants that made them conducive to his experiments and ii) with what organism do you think we could recreate his experiments that is not a pea plant (what other model organism might work to study what Mendel did)?Huntington disease is a rare fatal, degenerative neurological disease in which individuals start to showsymptoms in their 40s. It is caused by a dominant allele. Joe, a man in his 20s, just learned that his fatherhas Huntington disease.a. What is the probability that Joe will also developthe disease?b. Joe and his new wife have been eager to start afamily. What is the probability that their first childwill eventually develop the disease?
- If you try to throw a basketball into a basket, the likelihood ofsucceeding depends on the size of the basket. It is more likely thatyou will get the ball into the basket if the basket is bigger. In yourown words, explain how this analogy applies to the idea that thelikelihood of crossing over is greater when two genes are far apartthan when they are close together?According to Mendelian genetics, the phenotype of a homozygous dominant individual is the same as that of a _______ individual. A)Heterozygous B)Heterozygous recessive C)Hemizygous D)Homozygous recessiveMidphalangeal hair (hair on top of the middlesegment of the fingers) is a common phenotypecaused by a dominant allele M. Homozygotes forthe recessive allele (mm) lack hair on the middlesegment of their fingers. Among 1000 families inwhich both parents had midphalangeal hair, 1853children showed the trait while 209 children did not.Explain this result
- A cross between two pea plants, both of which grewfrom yellow round seeds, gave the following numbersof seeds: 156 yellow round and 54 yellow wrinkled.What are the genotypes of the parent plants? (Yellowand round are dominant traits.)Describe the characteristics of the garden pea thatmade it a good organism for Mendel’s analysis of thebasic principles of inheritance. Evaluate how easy ordifficult it would be to make a similar study of inheritance in humans by considering the same attributesyou described for the pea.Following the Rule of Non-Mendelian Genetics (Incomplete Dominances), In a genetic cross between one snapdragon flower that is Homozygous (ww) for white petal color and one snapdragon flower that is Hemozygous (WW) for red petal color. What would be the phenotype of the offspring? (Legend: W = red color; w = white color