echarternet Home G Google 3Ntional Hurricanecenter pr Press Republican ton, VT a

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echarternet Home G Google 3Ntional Hurricanecenter pr Press Republican ton, VT and Plattsb... ToPalm O veronews Your News Sou 2. Some species of cacti are very tall and usually have two L-shaped ams, one on caci side. Let's say you lived near the Sonoran desert, where cacti are common and you happen to have one growing in your backyard. Your cactus has two arms but one is longer than tac ouica Now, assume that anm lengths in these cacti are controlled by a single gene with ams of the same length (A) being dominant to arms of different length. A. What was the genotype of your cactus? B. Could one of the parents of your cactus have had a phenotype with arms the same length? Explain your answer.

Explanation / Answer

As per the I am answering the first question:

What was the genotype of your cactus? We know that the cactus is a/a, so both must have had one 'a' each.

Could one of the parents of your cactus have had a phenotype with arms with same length? Yes, if was A/a

i.e., Your cactus has a genotype of a/a and it must have received one 'a' from the female parent and one 'a' from the male parent. If one of those parents had a phenotype of arms that are the same length, it must also have had one A allele.

What would have been the genotype of that parent? A/a

While having the dominant phenotype, it must be able to pass on the recessive a allele.

I think you should have missed this question - Suppose you cross your cactus with that of your neighbor which has arms of the same length. Your great grandchildren (it takes a Saguaro cactus a long time to mature) find that half of the resulting offspring have arms the same length and half have arms of different lengths. What was the genotype of your neighbor's cactus?

Aa – if the other cactus had been AA, all of the offspring would have had arms of equal length.

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