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.
Answer: The nucleas contains the majority of the cell's genetic material. This material is organized as DNA molecules, along with a variety of proteins, to form chromosomes.
Multiple alleles: three or more alleles for a specific gene
polygenic traits: a trait controlled by a group of nonallelic genes
If i am not mistaken C) seems to be the correct answer.
When the action potential reaches<span> the </span>axon<span> ending, it causes another ion (calcium, Ca++) to enter the cell, which in turn causes the vesicles -- the tiny bubbles full of neurotransmitters -- to release their contents into the synaptic gap</span>
