The correct option is A. If a dominant allele is present, the recessive allele won’t be seen.
The dominant allele is the one which appear, and the recessive one isn't shown.
For example - If a person has 2 alleles of eye colour as B ( black ) and b ( brown ), in which black is dominant and the brown one is recessive, then the person will have black eye colour because only dominant allele shows its characteristics.
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As the semimajor axis of a planet increase, the orbital period will decrease and the speed of the planet will decrease.
<h3>What is Kepler's second law?</h3>Kepler's second law of planetary motion describes the speed of a planet traveling in an elliptical orbit around the Sun.
This law exaplains the speed of planets around the sun, the speed of the planet increases as it nears the sun and decreases as it recedes from the sun.
From the findings, the astronomical unit of the Mercury is 0.387 and the orbital period is 0.24 year.
From the equation above, as the semimajor axis of a planet increase, the orbital period will decrease and the speed of the planet will decrease.
Learn more about orbital period here: brainly.com/question/22247460
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