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25 September, 11:18

If a particular gene is located on the Z chromosome of this lizard species, describe why a lizard with a ZW genotype has a greater probability of expressing the recessive phenotype for the trait than a lizard with the ZZ genotype does.

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  1. 25 September, 15:10
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    The ZW is the sex-determination system for offsprings for some organisms such as birds, some reptiles etc.

    According to this system, the females have the sex chromosomes Z and W. Males have the sex chromosome ZZ.

    Females have a greater chance for expressing a recessive phenotype because they will need only one recessive allele on their Z chromosomes to express the recessive phenotype. On the contrary, males will have a lesser chance because in order to show the recessive phenotype they would require both the alleles on the Z chromosomes to be recessive.
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