. While on an African safari, you find two true breeding strains of a unique gir
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. While on an African safari, you find two true breeding strains of a unique giraffe. One strain has purple spots and long horns and the other has turquoise spots and short horns. When the two strains are crossed, all the Fi individuals have turquoise spots and short horns. You then cross the F1 heterozygote with a testcross individual. a. Use S/s for the spots trait and H/h for the horn trait to define your alleles. Use strategies from class (capital-dominant allele, lowercase recessive allele). b. Write the genotypes (as the alleles appear on chromosomes) and corresponding phenotypes of each of the following giraffes: both true breeding parent giraffes, the F1 progeny and the testcross giraffe. c. If the two genes are NOT linked and you cross of the F1 parent with a testcross individual, state the phenotype of each of the resulting progeny and the percentage of total progeny each phenotype would represent. d. You are told that the two genes ARE linked and are 8 map units apart. From the cross of the F1 parent with a testcross individual, state the phenotype of each of the resulting progeny and the percentage of total progeny each phenotype would represent.Explanation / Answer
As per the mendels experiment, in the f1 generation all the indivuduals will get the dominant gene features. in this regard, turquoise spots and short horns are considered as dominant genes. hence the second generation has the chance to get recessive gene which is reasonable for purple spots and long horn in 3:1 ratio.
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