Isolines, also referred to as contour lines, can be used to represent elevation on a map by connecting points of equal elevation, for instance. These imaginary lines provide a good visual representation of the terrain.
What is isoline in plant breeding?
Isogenic lines or isolines refer to those lines that are genetically identical except for the allele at one locus. In other words, isogenic lines have only one gene difference. The use of multiline cultivars was first suggested in oats by Jensen in 1952.
What is the meaning of Choropleth?
/ (ˈkɔːrəˌplɛθ) / noun. a symbol or marked and bounded area on a map denoting the distribution of some property. (as modifier)a choropleth map.
What is Dot method?
Dot method is used when cartographing mass scattered events. When marking some quantity of units of the event is mapped with the help of dots or more precisely with the help of circles. They are placed on the map in such points where this event is directly occur.
What is isopleth method?
Isopleth maps simplify information about a region by showing areas with continuous distribution. Isopleth maps may use lines to show areas where elevation, temperature, rainfall, or some other quality is the same; values between lines can be interpolated.
Which is the quickest method of plant breeding?
The quickest method of plant breeding is the (d) mutation breeding. The primary methods for the improvement of crops along with a tissue culture and genetic engineering are the introduction, selection, hybridisation, and mutation breeding.
What is back cross method?
backcross. A breeding method used to move one or a only a few desirable genes from an agronomically poor crop line to an elite line. This is done by crossing a donor parent to an elite line, and crossing offspring with the ‘desired gene(s)’ back to the elite parent.
How do you create near isogenic lines?
Near isogenic lines are generated by a process of repeated backcrossing with selection for the desired character at each round of crossing. After seven or eight backcrosses, individual selections are selfed to identify homozygotes at the target locus.
What is Isoheight?
An isoheight or isohypse is a line of constant geopotential height on a constant pressure surface chart. Isohypse and isoheight are simply known as lines showing equal pressure on a map.
What is an isoline example?
A line of constant value on a map or chart. Examples include isobar (equal barometric pressure), isotherm (equal temperature), and isohyet (equal precipitation).
What is Isonif?
A line on a climate map linking places with equal snowfall. …
What does isotherm mean in science?
Isotherm, line drawn on a map or chart joining points with the same temperature. Isotherms are commonly used in meteorology to show the distribution of temperature at the Earth’s surface or on a chart indicating constant level or constant pressure.
Who invented isolines?
The Dutch engineer Nicholas Cruquius drew the bed of the river Merwede with lines of equal depth (isobaths) at intervals of 1 fathom in 1727, and Philippe Buache used them at 10-fathom intervals on a chart of the English Channel that was prepared in 1737 and published in 1752.
Why is back cross done?
Backcross, the mating of a hybrid organism (offspring of genetically unlike parents) with one of its parents or with an organism genetically similar to the parent. The backcross is useful in genetics studies for isolating (separating out) certain characteristics in a related group of animals or plants.
Why do we do back crossing?
Backcrossing is a crossing of a hybrid with one of its parents or an individual genetically similar to its parent, to achieve offspring with a genetic identity closer to that of the parent. It is used in horticulture, animal breeding, and production of gene knockout organisms.
Why is breeding necessary?
PLANT BREEDING IS IMPORTANT : To feed the people and the planet • To adapt plant varieties to : – New needs: Consumer’s taste (bitter, seedless…)
What is multiline variety?
The term Multiline Genetics is used for a variety is a composite of genetically identical lines, except that each line possesses a different gene for resistance to the disease. This is also called Multiline Varieties. In the event of occurrence of a new race, some plants may be susceptible, but not all.
What is pure line selection?
Pure-line selection involves selecting and breeding progeny from superior organisms for a number of generations until a pure line of organisms with only the desired characteristics has been established.
What is a isopleth called?
a line drawn on a map through all points having the same numerical value, as of a population figure or geographic measurement. Also called isarithm.
What is an example of an isopleth map?
A broad term for any line on a weather map connecting points with equal values of a particular atmospheric variable (temperature, dew point, etc.). Isotherms, isotachs, etc. are all examples of isopleths.
How an interpolation is carried out?
Interpolation is a statistical method by which related known values are used to estimate an unknown price or potential yield of a security. Interpolation is achieved by using other established values that are located in sequence with the unknown value. Interpolation is at root a simple mathematical concept.