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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Biology => Topic started by: sam777 on October 16, 2021, 01:36:45 pm

Title: Question about Dihybrid Cross, Crossing Over and Phenotypic Ratio
Post by: sam777 on October 16, 2021, 01:36:45 pm

Hi,

Could someone please explain question 21 from the attached image?

Thanks!

Title: Re: Question about Dihybrid Cross, Crossing Over and Phenotypic Ratio
Post by: VCEStudent2034 on October 16, 2021, 05:49:27 pm

Quote from: sam777 on October 16, 2021, 01:36:45 pm

Hi,

Could someone please explain question 21 from the attached image?

Thanks!

Hi sam777!

I’m only in year 11, but I just learnt about linked and unlinked genes recently.

I’d be guessing that the answer is D), since linked genes are usually inherited together and the likelihood of crossing over (and, therefore, recombinants) is lower. Two of the ratios should be ‘1’, because that would be the (original) phenotypes of the parents. The other two possibility would have a ratio of less than 1, since the likelihood of recombinants is extremely low.

I hope this helped!