Answer:
4
Explanation:
Do not heat a test tube with the cork covering its open end. This is because this will result in buildup of pressure and ultimately lead to an explosion which could lead to injury. Instead, heat the test tube at an angle (with the mouth facing away from you or your neighbor) and close to a window so the emanating fumes are not directed at you. Heat the test tube gently without having to put it directly into the flame.
Scientists can examine sediment samples to get an idea of when major earthquakes occurred in the past. By measuring the amount of time between events, they can come up with a rough idea of when a major quake might hit.
Answer:
When a heterozygous male and homozygous female plants are cross-pollinated the genotypic ratio of the offspring will be tt, Tt
Explanation:
In a pea plant, when the heterozygous male plant (Tt) is cross-pollinated with homozygous female plant (tt) ;
T × t = Tt
t × t = tt
t × T = tT
t × t = tt
Therefore, the genotypic ratio of the offspring is short and tall (tt, Tt) because the dominance of tall trait is less that the short trait, indeed the chances of tall offspring is low.