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

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.

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.

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