The parent birds must carry the condition within their genotype. A carrier's genotype would be "Aa", with the recessive coding for the fatal condition so that it can be passed on to offspring, but the dominant allele assures that the parent does not express the condition.
Answer:
objective lenses
Explanation:
objective lenses with different magnifications, screwed into a circular "nosepiece" which may be rotated to select the required lens.
La celula debe copiar sus cromosomas
A scientific model is a claim or a theory that helps explain how a phenomenon works or how it undergoes process. This models provides scientists an understanding of the object or a situation undergoes change and generate certain outcomes or effects.