D is correct answer as shown in the picture .
Chromosomes are a DNA molecule, that cannot be seen underneath a microscope. However, the DNA in chromosomes become pushed together during cell division, which then allows scientists to see its material under a microscope.
Answer:
FERTILIZATION
Explanation:
Fertilization, the fusion of haploid gametes from two individuals, restores the diploid condition. Thus, sexually reproducing organisms alternate between haploid and diploid stages. However, the ways in which reproductive cells are produced and the timing between meiosis and fertilization vary greatly.
Answer:
IAi
Explanation:
The genotype for O blood is ii. So his mom must have given him an i allele. So he has at least one i allele.
But since his phenotype is A -- he expresses A -- there must be one IA allele. Otherwise, if he had both ii, he would be an O-type blood.
So his genotype must be IAi.
Narrow.
For a wide ring, it indicates a longer/faster growing season. Narrower ring means there is less growth, which is likely caused by poor growing conditions.