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lecture_17_notes - Lecture 17 Mendelian genetics Mendel...

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Lecture 17 Mendelian genetics Mendel First Law: the two copies of a gene segregate Test cross: an individual with the round phenotype has an unknown genotype. How to find out? Cross it to a wrinkled individual, whose phenotype is known by default: "rr". Assume thus that a female unknown is crossed to a male "rr". the female can be Rr or rr Rr: 1/2 of progeny is round, 1/2 is wrinkled Sperm r Egg R Rr r rr RR: all progeny is round Sperm r Egg R Rr How are different genes inherited? Consider the seed color trait: Yellow and Green. Yellow is dominant and thus the alleles are called Y (yellow dominant) and y (green recessive). Y_ is yellow, yy is green. Cross a yellow round plant (YYRR) to a green wrinkled plant (yyrr). The RrYy F1 is selfed. Hypothesis 1. Yellow and Round go together: R-Y and r-y. The F1 makes two types of gametes Sperm RY ry Egg RY RRYY RrYy ry RrYy rryy Three phenotypic classes are expected - 1 -
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Hypothesis 2. Yellow and Round are independent. The F1 makes four types of gametes: RY, Ry, rY, ry. Sperm RY Ry rY ry Egg
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