Discontinuous variation vs. discontinuous variation Urgent

Continuous versus discontinuous variation of traits.

Discontinuous variation: There are obvious differences in traits between individuals within the group, which are manifested as categorical differences, and the proportion of the number of individuals between types can be calculated by type division (grouping). (qualitative character).

Such as: pea flower color, cotyledon color, fullness of seeds, etc.

Continuous variation: There are no significant differences between individuals within a group, which are quantitative differences and cannot be grouped by phenotype. (quantitative character).

Human height, plant growth period, fruit size, seed yield, etc.

Continuous and discontinuous variation in different populations are illustrated by one example each. What is the difference between quantitative and qualitative traits? 3.Grant studied the inheritance of the length of the stigma of the mesogenerational flowers, and obtained the following statistical results.

They are all made of cells (there are single-celled organisms and multicellular organisms), because cells are the most basic life level and living system, and time-keeping is that life without cell structure such as viruses also needs to rely on cells to survive.

Classic Quotes of Gambling Bible Writers;

There is no theory in the world that can accurately describe all the phenomena in the universe

Some traits are morphological and structural characteristics, some are physiological structures, and some are behavioral patterns. In layman's terms, heredity refers to the similarity between parents and children, and variation refers to the differences between parents and offspring.

The traits of living things are controlled by a pair of genes, and the heredity and variation are caused by genetic mutations or chromosomal variations

The traits of an organism refer to the sum that includes all the characteristics of an organism. Such as morphological structural characteristics, physiological characteristics and behavioral patterns.

A brief description of major events in the history of the development of biological evolution.

The discovery of Mendel's laws of inheritance and the theory of its later formation.

Darwin's Theory of Evolution.

DNA is an experiment with genetic material.

Determination of the structure of the DNA double helix.

Many of the traits we observe are qualitative traits (discontinuous traits), such as red-eye-white-eyed, long-winged, straight-bristle-scorched bristles, etc., which are either/or, there is no intermediate transition type, and many of the genetic traits studied in the laboratory belong to this type. However, many variations in nature, as well as many important traits in animal and plant breeding, are continuously varied, called quantitative traits such as height, growth rate, yield, etc., which exhibit a range of variation from one extreme to the other. Quantitative traits are strongly influenced by both genes and environment, and are often determined by polygenic interactions, with the role of each gene being small and equal.

The following experiments will illustrate how quantitative traits can be studied and how to distinguish between the roles of genetic and environmental factors in quantitative trait decisions.

This experiment involved two inbred lines of Drosophila, which showed large differences in the number of bristles on the ventral plates. The bristles on the ventral plate are composed of 2 or 3 long bristles and a row of small bristles (Fig. 8-1), usually because the male is smaller, the number of bristles on the ventral plate is also smaller, so in order to avoid errors caused by sex differences, only the bristles on the side plate of the same sex (usually female) can be counted in the experiment. Of course, if the number of fruit flies is large enough, both females and males can be counted.

First, catch a fly, then pluck the hair, and finally, observe it with an electron microscope.

First of all, you need the necessary equipment:

Several fruit flies. Microscope.

Several slides.

Glue. Tweezers.

Fix the flies on the slide with glue.

Kill fruit flies. Look at it with a microscope.

One thing to note: don't let fruit flies fly.

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