The allele that causes sickle-cell anemia is the result of . a) an insertion leading to a frameshift mutation that changed all downstream codons b) a single base substitution causing a transversion mutation c) two chromosomal translocations followed by fusions d) a silent mutation, which is why it goes unnoticed until adulthood

Sickle-cell anemoa is caused by a mutation in the gane encoding hemoglobin, causing red blood cells to appear half-moon shaped? I don't know, maybe that. I just tiny

Explanation:

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

after making a punnet square using bv bv bv bv you will find that the ratio will be 9: 7 or a 128.6% probability.

hope this