Answer:
. d. peas have an unusually long generation time
Explanation:
Gregor mendel is a scientist, he was bored 20th July,1822. He carried out an experiment using pea plant and he is reffer to as the father of genetist. Mendel used seven traits of the pea plant in his experiments this include flower color which is either purple or white, flower position which is either axil or terminal stem length which could be long or short, seed shape (round or wrinkled), seed color (yellow or green), pod shape (inflated or constricted) and pod color (yellow or green). He uses pea plant because of the following reason,
pea plant has many observable characteristics that could be used such as flower colors,seed shape.
Pea plant is an annual crop that matures early, so earliness to maturation makes Mendel select pea
Mating in pea plant can be controlled. Pea plant are self fertilizing crop but he decided to control the mating pattern by cross fertilize them and avoiding contamination from other pea plant.
The experiment with pea pant would produce enough seeds for subsequent generation.
This experiment made Mendel propound 2 laws, law of segregation of gene and law of Independent assortment of gene.
Answer:
HIV (human immunodeficiency virus) causes AIDS (Autoimmune deficiency syndrome) and reduces the ability of body to fight infection.
HIV was first found in 1959 in a man from Democratic Republic of the Congo and then announced as a world pandemic by WHO.
Approximately 37.9 million people were infected with HIV globally in 2018 but the pandemic statistics vary around the world. Sub-Saharan Africa was most infected region from HIV in 2018 where 61% population was infected from HIV/AIDS. In South & South-East Asia, about 12% of all people infected with HIV in 2010.
Now WHO announced HIV as 'global epidemic".
Answer:
A tribute nation is a nation that pays another nation for protection.
Explanation:
The population would decrease because the food chain has been disrupted at the bottom
Explanation:
eukaryotic glycocalyx is present in prokaryotic cells, eukaryotic cells can also have glycocalyces especially single celled eukaryotic organisms.
