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Heredity Test Review Punnet Square: Chart used to predict the _______________ of two parents T T t T TT Tt Use the completed Punnet Square to answer the questions T T t T TT TT Tt Tt If T is the dominant allele for a straight tail in rats and t is the recessive allele for a curly tail: What is the probability of the rat offspring having a curly tail? What is the probability the offspring will be carriers of a curly tail trait? If you cross a rabbit that is heterozygous for floppy ears with a rabbit that is homozygous for short ears, (floppy ears F are a dominant trait) What are the possible phenotypes of the offspring? What is the ratio of floppy ears to short ears in the offspring? The Punnet square will look like this F f f Ff ff f Ff ff What are the possible phenotypes of the offspring? What is the ratio of floppy ears to short ears in the offspring? Now let’s think backwards! ? ? ? PP PP ? Pp Pp What would the genotypes of the parents be if you know the genotypes of the possible offspring? Ratio or Probability? The mathematical chance something will happen Written as a fraction or a percent ex. ½ or 50 % A comparison of two numbers Written as a fraction or with a colon between ex. 3/1 or 3:1 Heterozygous or Homozygous? A genotype that has two of the same alleles A genotype that has two different alleles for a trait ex. ex. Bb BB or bb You can also say it is ________________ You can also say it is ________________ Gregor Mendel concluded The recessive trait _________________ in the second generation. The dominant trait occurs in a ___ to ____ ratio with the recessive trait. Each plant had _____ set/s of instructions for each characteristic. Mendel chose pea plants because • they were fast growing • he knew a lot about them and they were • they were _________-pollinating