CN2135176Y

CN2135176Y - Chromosome behavior demonstrator

Info

Publication number: CN2135176Y
Application number: CN 92218221
Authority: CN
Inventors: 胡光杰
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-06-27
Filing date: 1992-06-27
Publication date: 1993-06-02
Anticipated expiration: 2002-06-27

Abstract

The utility model discloses a novel chromosome demonstration teaching aid used for helping teachers to change abstract to reification and change difficulty to easiness when the teachers teach three large rules of 'genetics', the structure variation of chromosome and the chromosome of cell mitosis and 'meioses' in biology. The utility model is composed of a plurality of gene letter fragments, the upper part of each fragment is in trapezoid shape, the lower part of each fragment is in square shape, a pressing bolt is arranged on the upper end of the facade of each fragment, gene symbols are marked on the lower part of each fragment, and the upper part and the lower part of the back of each fragment are respectively provided with a pressing nut of a snap fastener; the physical characteristic of the chromosome is revealed through the exchange and the combination of the fragments.

Description

Chromosome behavior demonstrator

The present invention relates to a kind of demonstration teaching aid, especially the demonstration teaching aid of chromosome behavior teaching usefulness.

Present existing chromosome model can only represent that chromosomal simple structure is as chromosomal two arms, kinetochore etc., but structure can not be dismantled, be assembled, and more can not give expression to it intuitively is the carrier of gene, can not satisfy the needs of setting forth the complex chromosomal behavior far away.

The purpose of this invention is to provide a kind of three big rules that can help the teacher professor's " science of heredity ", chromosomal structure variation reaches cell mitogen in " biology ", subtracts when teaching the chromosome behavior that divides, it is concrete changing abstract, and changing difficult is simple and easy new dyeing body demonstration teaching aid.

The objective of the invention is such realization: fragment profile top is trapezoidal, the bottom is a square, and there is the bolt of pressing of a snap-fastener its positive upper end, and the lower part indicates gene symbol, the back side respectively have up and down a snap-fastener by mother, the exchange of several fragments, be combined into chromosome and disclose chromosomal physical feature.

The present invention has following characteristics: (1) can go out nearly all argument of being set forth in the Morgan " gene theory " by figurative expression, such as: a, gene are chromosomal parts.B, gene are arranged in a linear on chromosome.Exchange and double crossing over can take place between c, the homologue fragment, and genes carried also shifts thereupon on the fragment simultaneously.When two pairs of different genes were arranged on d, the homologue, they were on the different positions.E, chromosome have repetition, inversion, translocation phenomenon.(2) this teaching aid can be expressed chromosomal physical feature, can free rotation, also image comparatively of distortion, coiling, centromere.(3) during this teaching aids making, two homologues are write gene symbol with different colours, fragment exchange and do not exchange very clear.(4) this teaching aid constitutes whole chromosome and only uses a kind of parts and simple in structure, makes and uses comparatively easyly, can fold simultaneously.

Fig. 1 fragment front view (FV).

Among Fig. 1: gene letter 1, press bolt 3.

Fig. 2 fragment reverse side figure.

Among Fig. 2: by female 3.

The chromosome synoptic diagram that Fig. 3 is linked to be.

Two homologue single crosses after the exchange of Fig. 4 fragment are changed and the double crossing over synoptic diagram.

Below in conjunction with Fig. 4 and embodiment the utility model is described.

Use-case such as Fig. 4, the single cross of two homologues after the exchange of expression fragment is changed and double crossing over.With the expression genetic fragment every back side by female 3 and the positive bolt 2 of pressing, by top H, L, K, I, J, the order of bottom A, B, F, G is by connecing, and solid word (black) KIJ and outline letters (redness) KIJ are that the result is changed in single cross, and the solid word F in left side outline letters f and the right is the double crossing over result.

Claims

A kind of chromosome demonstration teaching aid is characterized in that the fragment profile top of teaching aid is trapezoidal, and the bottom is a square, there is the bolt of pressing of a snap-fastener its positive upper end, the following gene symbol that partly indicates, the back side respectively have up and down a snap-fastener by mother, some fragment combination, exchange, disclose chromosomal physical feature.