Biotechnology: Wollemi pines

Question one

The Wollemi pines have been shown to be susceptible to the die back fungus(Phytophythora cinnamomi) that attacks trees in other Australian native forests. One species of pine has resistance to this fungus because of a single gene. Discuss how biotechnological technique could be used to develop Wollemi pines that are resistant to the die-back fungus. In your discussion, include that may result from the procedures involved.

Answer

Wollemi pines could be made resistant to die-back fungus using process of transgenesis  – taking organism resistant to fungus, identify resistant gene, cut using restricti

on enzymes, cut plasmid to infect pine.

Concerns

Gene product may interact with products of another gene, transfer process may disrupt ability for gene to offer resistance, gene may insert in middle of a vital Wollemi pine gene and disrupt ability of that gene to function (produce non functional protein), gene may only function sporadically because not inserted into a chromosome therefore disrupting its ability to offer resistance.

Ionic bonding and Covalent bonding

Ionic bonding

Ionic bonding usually happens from reaction between metal and non-metal elements. You can see ionic bonding from a compound like NaCl (Sodium chloride). The forces of attraction between oppositely charged ions are called ionic bonds. As you can see in the diagram, Na+(Sodium ion) is a positive and Cl-(Chloride ion) is a negative ion. This is because sodium has lost one of its electron on it’s outer shell and chlorine has gained one electron from sodium element.

Sodium is an element but it becomes ion when it loses it’s electron from the outer shell. Chlorine is also an element – so it becomes negative ion as it gains a electron from the sodium.

An ionic bond (or electrovalent bond) is a type of chemical bond based on electrostatic forces between two oppositely-charged ions.

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Covalent bonding

Covalent bonds are forces that hold non-metal atoms together. The forces are formed when the atoms of a molecule share electrons.

As you may know, an atom is made of a tiny core called a nucleus, with tiny particles called electrons traveling about the nucleus. Sometimes when atoms come together, two electrons will start to travel about the nuclei of both atoms. The two atoms then share the pair of electrons.