Two membranes contain and protect the inner parts of the chloroplast. They are appropriately named the outer and inner membranes. The inner membrane surrounds the stroma and the grana (stacks of thylakoids). One thylakoid stack is called a granum.
Natural selection<span> acts upon two major sources of genetic variation: </span>mutations<span> and</span>recombination<span> of </span>genes<span> through sexual </span>reproduction<span>. Most </span>mutations<span> do not affect the reproductive fitness of individuals -- some may be beneficial, some may be harmful, and </span>many<span> may be neutral. </span>Mutation rates<span> per gene are generally low</span>
Answer:
Phenotypic ratio: 0 Red : 4 Pink : 0 White
Genotypic ratio: 0RR : 4RR' : 0R'R'
Explanation:
This question involves a single gene coding for flower colour in Japanese four o'clock plants. The allele for red color (R) exhibits incomplete dominance over the allele for white color (R'), hence, they form a hybrid (RR') that is blending of both phenotypes (Pink).
In a cross between a red plant (RR) and white plant (R'R'), red and white four o'clock plant will produce gametes R and R' respectively. Using these gametes in a punnet square (see attached image), four possible offsprings that all have a genotype: RR' will be produced. This means that all offsprings of this cross are pink colored.
Therefore,
Genotypic ratio= 0RR : 4RR' : 0R'R'
Phenotypic ratio= 0Red : 4Pink : 0White
Answer:
The best explanation for a partial solar eclipse is that moon only partially covers the sun during the eclipse (option D).
Explanation:
A solar eclipse occurs when the<u> moon stands between the sun and the earth</u>, which happens when the moon is near the plane of the ecliptic, that is, the point where the orbits of the earth and the sun intersect.
A partial solar eclipse occurs when the moon partially covers the sun, which depends on the observer's point of view on the earth and his geographical location.
The other options are not correct because:
<em> A. If the earth stands between the sun and the moon, </em><em><u>lunar eclipses </u></em><em>occur.
</em>
<em> B and C. During a solar eclipse it is not possible to see</em><em><u> lunar phases</u></em><em>, which occur when the sun's rays are reflected off the satellite.</em>