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Download HW#20: Rubber Traits
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Name__________________ Date___________________ Block__________________ HW#20 “Traits and Inheritance” RUBBER TRAITS 1) What are the differences between a phenotype and a genotype? _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ 2) Use Punnett squares to determine the results if Mendel was to continue had a third generation (F3) of flowers. Write out the Punnett squares using the 3 different genotypes of the flowers (PP, Pp, and pp). P P P P P P P P P p p p p p p p 3) Using the data from the previous question, calculate the ratio of dominant to recessive traits. You may need to look at the “Mendels and his peas” reading to help you with ratios. a) How many of these plants show a dominant trait (PP or Pp)?__________ b) How many of these plants show a recessive trait (pp)?______________ Divide the number of recessive traits by the number of dominant traits to find your ratio._____________________________ 4) How are genes and alleles related to genotype and phenotype. __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ 5) What is incomplete dominance? __________________________________________________________________ __________________________________________________________________ 6) The Punnet square below shows the alleles for fur color in rabbits. Black fur, B, is dominant over white fur, b. Bb Bb Bb Bb a) Given the combination show, what are the genotypes and phenotypes of the parents? __________________________________________________________________ __________________________________________________________________ b) If black fur had incomplete dominance over white fur, what color would the offspring be? __________________________________________________________________ __________________________________________________________________
