Chapter 13 review 1 A phenotype is a characteristic expressed from the genotype of an observed organism 2 Pure lines of peas mean that all peas created from crossing with its self have the same material 3 If you cross a male round pea with a female wrinkled pea and the offspring are all round peas this indicates that the allele for round peas is and the allele for wrinkled peas is 4 Why do recessive traits only show up in the F2 generation 5 The principle of segregation as defined by Mendel is that each must segregate during the formation of gamete cells 6 By dihybrid crosses Mendel was able to show that two gene segregate of each other 7 If a recessive pea rr is crossed to a dominant phenotype individual who is heterozygous Rr in the F1 generation you could expect to see the recessive phenotype of the time and the dominant phenotype of the time If you examine the genotype you would expect to find two dominant alleles of the time one dominant one recessive of the time and two recessive alleles of the time 8 A sex linked trait is found on one of the chromosomes 9 When neither allele can display dominance the resulting phenotype is called dominance 10 A is used to map the genetic history of one gene through a family 11 Autosomal dominance is found when the trait is displays when only allele is required to observe the phenotype 12 If males are more likely to have a trait than females than the allele is most likely found on the chromosome and is 13 Draw a pundit square for the following cross where A is dominant a is recessive A gives an orange pea a gives a purple pea Tell the frequency of the possible phenotypes Aa x aa
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