Answer:
Polygenic is a phenotype that is influenced by more than one gene, Pleiotropy occurs when one gene influences two or more unrelated phenotypic traits.
Explanation:
A polygenic trait is influenced by something, while Pleiotropy influences two or more phenotypic traits...so in simple words, one is influenced by something and the other influences different things
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Your answer would be the second one B
Answer: B (Color blindness)
Explanation:
Typical red-green color blindness in human patients is caused by mutations on genes located in the X chromosome. These mutations act in a recessive manner. Since females have two X chromosomes, the presence of a mutation in a single one of them does not normally result in color blindness. Males, in contrast, have a single X chromosome and therefore the presence of a mutation is likely to cause the disease.
About the other options: Down‘s syndrome is a numerical chromosomal anomaly, not related to sex. Human blood type is a codominant trait. Finally, tail length in dogs is a polygenic trait not amenable to classic Mendelian analysis.
<span>Vertebrates and invertebrates</span>