Formation of female gametes of gymnosperms
Explain the formation of the female gametes of gymnosperms and also the relationship between this process and the concept of the alternation of generations?
Expert
In female strobiles (cones) there exist megasporophylls (fertile leaves of the strobile) which consist of megasporangia. In the megasporangium the spore mother cell go through the meiosis producing four haploid cells of which three regress and one provides birth to the functional megaspore. The functional megaspore through the several mitosis forms the female gametophyte which consists of the oospheres or female gametes of the plant. The female gametophyte is situated inside the megasporangium which has a small opening, the micropyle, through which pollen tube penetrates. The process is related to the diplobiontic life cycle (alternation of generations) as the functional megaspore produces the haploid stage of plant (the female gametophyte).
Describe the logical order in which the concepts of molecules, atoms, cells and so on up to the biosphere are related?
PAM Matrices: PAM matrices is Percentage of Acceptable point Mutations, developed by Dayhoff mutation data matrix. He developed this method along with his co-workers during analysis of the evolution of proteins. This gives the probability of one amino
Write down the main structures in the cell nucleus?
As the law is ambiguous, business managers will often face decisions that will rely on their ethical judgments. Comment on this statement, be sure to use an example to elaborate.
How respiratory system of the insects (with its independence between circulation and respiration) related to motor agility of some species of this arthropod class?
A tendency to regard one's own group, culture, or nation as superior to others. This is what sometimes occurs in a selective club, religious sect, or political organization. People who are ethnocentric see their group-related customs or beliefs as 'right ' and evaluate other, beliefs or pra
From which germ layer do the epidermis and nervous system initiate? Name the other tissues and organs made from germ layer?
Define the term ADP phosphorylation? What correspondingly are oxidative phosphorylation and photophosphorylation?
Write down the cause of the immunodeficiency presented by the AIDS patients?
Explain anemia? List four main types of anemia?
18,76,764
1948787 Asked
3,689
Active Tutors
1430449
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!