Question

In: Biology

You cross true breeding blue and red morning glories and get all blue offspring. a) Based...

You cross true breeding blue and red morning glories and get all blue offspring.

a) Based on this information alone:

i) How many loci are involved in the expression of this trait? How many alleles? What are the dominant and recessive interactions between the alleles at the locus/loci?

ii)what are the possible genotypes of the parents and F1s?

iii) Based on your hypothesized genotypes from ii, what do you expect the outcome of a cross between the F1's to be? (i.e. what phenotypes in what ratios?)

b) You then cross the F1 individuals and you obtain the following results

Blue - 200

purple - 126

red - 24

i) Are these results statistically consistent with your hypothesis above? (prove it!)

ii) If not, what is an alternative hypothesis that might explain these results? Are these results the result of one locus or 2? Test your new hypothesis using chi-squared test. Discuss the meaning of your results. (Note: If your hypothesis proves wrong, that is OK!!! But you have to be able to discuss why you think it's wrong.)

Expert Solution

You cross true breeding blue and red morning glories and get all blue offspring.

a) Based on this information alone:

i) Here only one locus is involved in the expression of this trait. 2 alleles are involved. For blue BB is the dominant and for red bb is recessive.

ii) The possible genotypes of the parents and F1s are- genotype of blue parents - BB and the F1s are Bb(heterozygote)

b) You cross true breeding blue and red morning glories and get all blue offspring.:- according to this statement, this three type of phenotype data or these results are not statistically consistent with my hypothesis. Because here only 2 type phenotypes are arise depends on all parental and F1s genotypes.

ii) If not, then here alternative hypothesis is co-dominance might explain these results. Where B and b alleles are dominant over one another, no one are recessive here. Here homozygous shows different phenotype and heterozygote shows a another mixed phenotype like purple.

Yes, these results the result of one locus.

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gladiator answered 1 year ago

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