Answer:
9:3:3:1
Explanation:
This question involves two different genes coding for height and flower color respectively. The first gene posseses allele T (dominant) and t (recessive) while the second gene possesses allele P (dominant) and p (recessive).
According to this question, two heterozygous tall and purple flowers are crossed i.e. (TtPp x TtPp). Each parent will produce the following gametes combination:
TtPp - TP, Tp, tP, tp
Using these gametes in a punnet square, the following proportion of offsprings will be produced:
T_P_ (tall, purple) = 9
T_pp (tall, white) = 3
ttP_ (short, purple) = 3
ttpp (short, white) = 1
Hence, the ratio of this cross is 9:3:3:1
Explanation:
Many invertebrate animals cant survive in water that has been polluted and resulted in a lowering of oxygen concentration so the presence or absence indicates the extent to which a body of water is polluted.
Lichens can be used to indicate air pollution as they grow exposed to places such us rocks and tree barks. They need to be efficient at absorbing water and nutrients to grow there. Rain water contains enough nutrients to keep them alive. Air pollutants dissolve in rain water especially sulfur dioxide can damage lichens and prevent them from growing. This makes them a natural indicator of air pollution.
A pregnant woman's energy requirements increase by about 350 to 450 kcal per day in the last two trimesters. Dietary intake during pregnancy must provide the energy that will ensure the full-term delivery of a healthy newborn baby of adequate size and appropriate body composition. This explains why there is an increase in energy requirements in the last two trimesters.
The lava solidifies into hard rock making new landforms
Answer:The very tip of the root is the root cap, a thimblelike cone of cells that protects the delicate, actively dividing cells of the apical meristem. The root's apical meristem has two roles: It replaces the cells of the root cap that are scraped away by the soil, and it produces the cells for primary growth.
Explanation:
