Why Do Offspring Inherit A,a or a Instead of A,a and a,a in Genetic Crosses?

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Discussion Overview

The discussion revolves around the inheritance patterns of offspring from genetic crosses, specifically examining why certain genotypes arise from parents with specific alleles. The focus is on the interpretation of gamete formation and the resulting genotypes of offspring in the context of Mendelian genetics.

Discussion Character

  • Homework-related
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions why a cross between parents with genotypes Aa and aa results in the offspring genotypes A,a and a, rather than A,a and a,a.
  • Another participant expresses confusion over the term "division" and suggests that the question may have been misphrased or unclear.
  • A later reply clarifies that if one parent has the genotype aa, they can only produce gametes with the allele a, not a,a, indicating a misunderstanding of haploid versus diploid genotypes.
  • There is a suggestion to review definitions related to genetics to better understand the concepts being discussed.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the clarity of the original question or the terminology used. There is some agreement on the understanding that a parent with genotype aa can only produce a gamete with allele a, but the overall confusion regarding the phrasing and implications of the question remains unresolved.

Contextual Notes

There are limitations in the clarity of the original question, particularly regarding the use of the term "division" and the representation of haploid and diploid genotypes. The discussion does not resolve these ambiguities.

Medicol
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1. If parents contain Aa and aa for example, then why their division doesn't result in
A,a and a,a but only A,a and a ?




Homework Equations


Nothing related.


The Attempt at a Solution


I don't know
 
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Medicol said:
1. If parents contain Aa and aa for example, then why their division doesn't result in
A,a and a,a but only A,a and a ?




Homework Equations


Nothing related.


The Attempt at a Solution


I don't know

No context here to associate a meaning to the question.

At the very least quote the exact question.

Don't know what 'division' means here and anything saying
"doesn't result in A,a... but only A,a and..." sounds like having been garbled.

Sounds like diploid genotypes so what is a?
 
Thank you, I am asked what genotypes the children may have from such 2 parents. And I wonder why the haploid gamete genotype of the mother (aa) is only a but not a,a.
A, a are dominant and regressive genes.
 
You may need to read back particularly definitions of the terms. Or http://www.ksu.edu/biology/pob/genetics/defin.htm


This seems now to be about 'haploid genotype'. If the mother (or father) is of is of genotype aa she (or he) can produce only a gametes seems to be all they are saying.
 

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