Homework Help

A plant has the genotype AarrSs. Cross out the gene combinations that cannot beproduced...

user profile pic

user6933212 | eNoter

Posted April 15, 2013 at 8:57 PM via web

dislike 1 like

A plant has the genotype AarrSs. Cross out the gene combinations that cannot be
produced or are not normal in the haploid gametes of this plant:

Aas

ArS

Ars

arS

aRs

Arr

AS

AArrSs

1 Answer | Add Yours

user profile pic

trophyhunter1 | College Teacher | (Level 3) Senior Educator

Posted April 16, 2013 at 12:36 AM (Answer #1)

dislike 2 like

Due to the Law of Segregation, members of a gene pair must separate into the gametes. Therefore, two a's won't be found in one gamete because they are homologous and will separate into different gametes. Therefore, any combination of  letters a, r, or s will work. Due to the Law of Independent Assortment, the genes assort independently of one another into the gametes that are produced. Therefore, ArS, Ars, aRs are correct. Other possiblilities not listed include: arS and ars. Because most organisms have more than three gene pairs, and they can combine in so many ways within the sex cells, this leads to variations not only in various members of a species, but among one's own family. 

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes