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djyliett [7]
3 years ago
5

The data above represent the results of three different crosses involving the inheritance of a gene that determines whether a ce

rtain organism is blue or white. Which of the following best explains the mechanism of inheritance of the gene
Biology
1 answer:
prohojiy [21]3 years ago
4 0

Answer:

The statement that best explains the mechanisms of inheritance of gene "The allele for blue is an X-linked dominant allele because there are no blue male offspring in cross 2."

Explanation:

The mechanism for inheritance of gene is the condition, in which the mutation when happens in one allele and cause the effect in the relevant phenotype. Similar inheritance will also be seen when the mutated allele will produce new type of the protein which will have deletorious effect on the normal function of the cell. In case of the single gene, autosomal dominant, autosomal recessive, X-linked dominant, X- linked recessive and mitochondrial are modes of inheritance.

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What is the probability that each of the following pairs of parents will produce the given offspring: 1. AABbCc x aabbcc à AaBbC
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1) AaBbCc, 50% - 2) AAbbCC, 3,125% - 3) AaBbCc is 12,5%.

Explanation:

<u>1º cross</u>.

Parental)          AABbCC             x               aabbcc

Gametes)   ABC   AbC   ABC    AbC    ABC    AbC    ABC    AbC

                   abc    abc   abc     abc      abc     abc     abc     abc

Punnet Square)   <em>Only filled with the progeny genotype AaBbCc</em>.

             ABC       AbC       ABC       AbC         ABC      AbC         ABC     AbC

abc      AaBbCc     ---      AaBbCc     ---         AaBbCc     ---        AaBbCc    ---  

abc      AaBbCc     ---      AaBbCc    ---         AaBbCc     ---        AaBbCc    ---  

abc      AaBbCc     ---      AaBbCc     ---         AaBbCc     ---        AaBbCc    ---  

abc      AaBbCc     ---      AaBbCc     ---         AaBbCc     ---        AaBbCc    ---  

abc      AaBbCc     ---      AaBbCc     ---         AaBbCc     ---        AaBbCc    ---  

abc      AaBbCc     ---      AaBbCc     ---         AaBbCc     ---        AaBbCc    ---  

abc      AaBbCc     ---      AaBbCc     ---         AaBbCc     ---        AaBbCc    ---  

abc      AaBbCc    ---      AaBbCc     ---         AaBbCc     ---        AaBbCc    ---  

   

F1 Genotype)    32/64 AaBbCc

                          32/64  AabbCc (shown as the symbol "---" in the      

                          punnet square)

The probability of producing offspring with genotype AaBbCc is 50%.

---------------------------------------------------------------------

<u>2º cross.</u>

Parental)          AABbCc            x               AaBbCc

Gametes)   ABC   ABc   AbC    Abc    ABC    ABc    AbC    Abc

                     ABC   ABc   AbC     Abc   aBC    aBc     abC    abc

Punnet Square)   Only filled with the progeny genotype AAbbCC.

          ABC    ABc      AbC      Abc     ABC     ABc     AbC       Abc

ABC      ---       ---          ---          ---        ---        ---          ---           ---  

ABc       ---       ---          ---          ---        ---        ---          ---           ---  

AbC       ---      ---    AAbbCC     ---       ---         ---     AAbbCC    ---  

Abc       ---       ---          ---           ---       ---        ---          ---           ---

aBC       ---      ---          ---           ---        ---       ---          ---           ---  

aBc       ---       ---          ---           ---        ---       ---          ---           ---  

abC      ---       ---          ---           ---        ---        ---          ---          ---  

abc       ---       ---          ---           ---        ---        ---          ---          ---

   

F1 Genotype)  2/64 AAbbCC

                       The rest of the progeny have different genotypes that are represented with the symbol "---" in the punnet square.

The probability of producing offspring with genotype AAbbCC is 3,125%.

--------------------------------------------------------------------

<u>3º cross.</u>

Parental)          AaBbCc            x              AaBbCc

Gametes)   ABC   ABc   AbC    Abc    aBC    aBc    abC    abc

                     ABC   ABc   AbC    Abc    aBC    aBc    abC    abc

Punnet Square)   Only filled with the progeny genotype AaBbCc.

          ABC       ABc       AbC       Abc      aBC     aBc       abC       abc

ABC      ---           ---          ---           ---         ---        ---           ---      AaBbCc    

ABc       ---           ---          ---           ---         ---        ---      AaBbCc     ---  

AbC      ---           ---           ---          ---          ---    AaBbCc    ---           ---  

Abc       ---           ---           ---          ---     AaBbCc  ---           ---           ---

aBC       ---           ---           ---     AaBbCc    ---         ---          ---           ---

aBc       ---            ---       AaBbCc   ---          ---        ---           ---          ---  

abC      ---       AaBbCc      ---          ---          ---        ---           ---          ---  

abc   AaBbCc       ---            ---       ---           ---        ---           ---          ---

   

F1 Genotype)  8/64 AaBbCc

                       The rest of the progeny have different genotypes that are represented with the symbol "---" in the punnet square.

The probability of producing offspring with genotype AaBbCc is 12,5%.

7 0
3 years ago
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