1. You have flowering plants where yellow flowers (Y) are dominant to white, tal
ID: 5842 • Letter: 1
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1. You have flowering plants where yellow flowers (Y) are dominant to white, tall plants (T) are dominant over short plants, and round seeds are recessive to oblong (O). You grow a tall plant with yellow flowers that came from an oblong seed. How would you determine whether this plant is heterozygous or homozygous for each trait? Set up a Punnet Square for the cross. If you set your null hypothesis to state the plant was heterozygous for each trait, and your data for the experiment resulted in the following phenotypes and number of observations, what is your plant’s genotype? Yellow – Tall – Oblong: 229/928 Yellow – Tall – round: 234/928 white – Tall – Oblong: 233/928 white – Tall – round: 232/928Explanation / Answer
YyTtOo x yyttoo Null hypothesis There is no difference between observed and expectedfrequencies Dihybrid test cross 1:1:1:1 Phenotype observed expected frequency requency difference (O-E)2 /E Yellow – Tall – Oblong: 229 232-------------3 --------9/232-----------0.038 Yellow – Tall – round: 234232-------------2-------------4/232--------------0.01 white – Tall – Oblong: 233232-------------1----------1/232---------------0.004 white – Tall – round: 232232-------------0------------------0/232--------0 0.052 Null hypothesis There is no difference between observed and expectedfrequencies DEGREES OF FREEDOM:NO OF PHENOTYPES -1= 3 LEVEL OF SIGNIFICANCE ----------5% Table value------------7.815 Null hypotheis is acepted . There is no difference between observed and expected frequencies
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