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20 April, 19:51

Zebra mussels have the following genotypes and phenotypes. Which cross would the greatest number of heterozygous offspring. A) AA x aa C) AA x Aa or D) aa x Aa

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  1. 20 April, 20:05
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    In Zebra mussels the cross that would the greatest number of heterozygous offspring is AA X aa (option A).

    Explanation:

    For a specific trait the cross that provides the greatest amount of heterozygous offspring is that of two pure lines, dominant and recessive. In this case, AA x aa will have a 100% probability of heterozygous (Aa) offspring, as can be seen in a Punnett chart:

    Alelles A A

    a Aa Aa

    a Aa Aa

    AA X Aa will only have a 50% chance of heterozygous offspring, as will the cross aa X Aa.

    - AA X Aa

    Alelles A A

    A AA AA

    a Aa Aa

    - Aa X aa

    Alelles A a

    a Aa aa

    a Aa aa

    A heterozygous genotype results in two different alleles being found in one gene, which determines a specific trait, where the dominant characteristic is expressed in the phenotype.
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