Spermatophyte Essays

Both Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) and red alder (Alnus ruba Bong) use seeds as a method of reproduction. Gymnosperms, such as Douglas-fir, have “naked” seeds (i.e. no fruit), while angiosperms, such as red alder, usually have seeds in fruit (catkins for red alder). Douglas-fir and red alder have seeds that use wings, signifying the use of the wind as a method of seed dispersal. Both trees have seeds than are covered in a seed coat and have nutrient reserves. Gymnosperms

Introduction It’s a vegetable that doesn’t provide any nourishment, originally it was used to cure illness, and the first president of the United States, George Washington grew it.2 Today, an acre of tobacco can be sold for approximately thirty-five hundred dollars an acre, making it one of the most profitable crops to grow.2 Historically, tobacco played an important role in the founding of the United States, during the revolutionary war, Benjamin Franklin was able to secure a loan from France using

Gregor Mendel was born in 1822. He was an Augustinian monk and is known as the father of genetics, who carried out numerous crosses in the mid 1800s. He worked mainly on garden pea plants where his works led into two laws. Mendel’s law of segregation, also his first law states that, • Inherited characteristics are controlled by pairs of factors now known as alleles • These factors segregate at gamete formation so that only one factor is carried in each gamete. Mendel predicted that alleles which

An explanation of Mendel's law of segregation Gregor Mendel was an Austrian monk in the 19th century. He experimented with pea plants to try figure out how heredity traits are passed on. He crossed several different types of pea plants with distinctive traits. One example is he crossed a true breeding pea plant with green pod color and a true breeding pea plant with yellow pod color. The resulting generation had an offspring, with a one hundred per cent growth, of pea plants with green pod color