14 22 points A certain alpine plant blooms with red flowers, and I stumble upon a plant with white f

1) The inheritance of plant traits can be reflected by asexual reproduction, and plant tissue culture can be used to observe the results of the record to see whether the current type of parent-child representatives is consistent, and to judge whether it is the result of changes in genetic material.

Answer: (1) Plant tissue culture is cultivated under the same and suitable conditions.

The appearance of white flower traits is the result of genetic mutations.

Same environment This is a characteristic of scientific experiments, that is, to verify the experiment, repeat the experiment, and the conditions are the same!

There are some flowers that are cultivated under different conditions and produce different colors!

There was an example in the book before, saying that it was a white flower below 20 degrees, and a red flower above 20 degrees!

And you should, take a look at the second question! The second question is mainly to discuss the different mutation rates under different conditions, and the comparison is to think that this empty is-cultivation under the same and suitable conditions-

ps: The understanding on the first floor is completely wrong, and the same environment here refers to the same natural environment on the mountain, which is a verification experiment, requiring the same conditions, where does the variable come from!

The same environment here means that the environment in which you grow the IVF seedlings is the same, but not the same as the natural environment in the mountains, and the same environment is to ensure the principle of a single variable, that is, whether it is a genetic mutation.

Hope it helps.

And I've thought a little bit about your question, the same environmental conditions are for this plant to grow under the same environmental conditions, to reduce errors. The results are more convincing, and the white flowers show that it can be passed on to the next generation. But the plant anomaly caused by environmental conditions is just the adaptation of the plant to adversity, but this can be regarded as a more valuable adversity, but its difference is not hereditary, which means that it may be influenced by the environment, and the key is not the same environment, but whether it can be inherited.

I hope it helps, and I've learned from what my previous teachers have taught.

1) If the flower color is controlled by a pair of alleles D and D, and the safflower plants in the inbred offspring of the safflower plant are all heterozygous DD, it means that DD is homozygous and lethal According to the law of gene segregation, the phenotype and ratio of the inbred offspring of safflower plants are safflower:white flower=2:1

2) From the graphical analysis, it can be seen that the relationship between the chromosomes where DNA1 and DNA2 are located in the somatic cells of the plant is homologous chromosomes From the graphical analysis, it can be seen that genes D and E are on one chromosome, genes D and E are on the other chromosome, and the genotype is DDEE, and the plant with the genotype DDEE follows the law of gene segregation when it is inbred, so the genotype of its offspring is DDEE:DDEE:DDEE=1:

2:1 According to the figure, plants containing both D and E are safflowers, so DDEE is safflower, accounting for 1

DDEE and DDEE are white-flowered and both are homozygous

So the answer is: 1) Safflower: white flower = 2:1

2) Homologous chromosomes. White Flower 1 is not.

Answer: Genetic recombination can only recombine various relative search traits of organisms, but cannot produce new genes and new traits; Changes in environmental conditions generally do not alter the genetic material of organisms and are therefore generally not heritable; Whereas, gene segregation refers to the segregation of genes on homologous chromosomes that do not produce new traits.

The plant that blooms the safflower has a white flower by chance, that is, the plant has a difference in the color of the flower, that is, the variation Variation can be divided into heritable variation and non-heritable variation

Non-heritable variations are caused by the environment, such as: a pair of twins, the older brother lives in the city, **white, the younger brother is in the countryside, **black This is caused by the environment, not heritable, i.e., the younger brother's offspring are not necessarily black

The mutations that can be heritable are caused by changes in genetic material, that is, caused by genetic mutations, because genes determine traits, genetic changes, and traits will also change The offspring of the white flower in this question are still white flowers, indicating that the trait of white flowers is heritable, so the reason for the occasional appearance of this white flower in safflower is that it is said that there is a genetic mutation

Therefore, C

1) If the flower color of the flower is controlled by a pair of alleles, according to F2

Phenotypic safflower: white flower = 3:1, red can be judged to be dominant, f2

The probability of homozygous for safflower is 1 3 and the probability of heterozygous is 2 3 In safflower, the frequency of safflower genes is 2 3 and the frequency of white flower genes is 1 3 F3 obtained by self-inbreeding of selected safflowers

The gene frequencies of safflower and white flowers remained unchanged and remained 2 3 and 1 3

2) According to the red pigment-producing genes, A is dominant to A and B is dominant to B, and the expression of one of these genes can inhibit the synthesis of all pigments in the petals; and hybridized in F2

Manifested as safflower:white flower = 1:3, it can be assumed that the gene that can inhibit the production of petal pigment is the B gene Therefore, the genotype of wild-type safflower is AAB

Hybridization combination of f1

The phenotype is all white flowers, indicating that its genotype is AABB Hence, F2

The phenotype and ratio were safflower (1AAB, 2AAB): white flower (1AAB, 2AABB, 2AABB, 4AAB, 1AABB, 2AABB, 1AABB) = 3:13, of which there were 7 genotypes of white-flowered plants

F2 of Group I, Group I

The genotypes of safflower plants were 1AAB and 2AAB, and the probability of the same genotype was 1 3 1 3 + 2 3 2 3=5 9

3) The method of introducing foreign genes into plant cells is genetic engineering, and the tools used are carriers

Since white color does not affect other colors, flower somatic cells with the genotype AABB are selected as recipient cells to breed flowers with pure blue flowers

In order to shorten the breeding period and obtain stable blue flower strains as soon as possible, the most common method is haplotype breeding

So the answer is: 1) Red 1 3 1 3

2) b AABB safflower: white flower = 3: 13 7 5 9

3) Carrier AABB haplosport species.

Answer: A continuous inbred offspring do not have trait segregation, indicating that the organism is homozygous, and the emergence of new traits is usually due to genetic mutations to produce new genes, resulting in the emergence of new genotypes, so option A is correct.

Homozygous red in inbred F1: Heterozygous red 1:2, homozygous safflower inbred 1 3 all AA, heterozygous flower inbred, aa2 3 1 4, aa2 3 2 4, aa2 3 1 4

a. If the chromosomal segment where the safflower gene is located is lost during the development of the flower bud, white flowers will bloom, and a is wrong;

b. Trait separation occurs in the process of sexual reproduction, and it is known from the title that the process does not involve the process of sexual reproduction, so the plant trait separation is not the reason for the white flowers on the plant, b is correct;

c. If the safflower gene is a dominant gene, and the related somatic cells have recessive mutations and become AA, they will bloom white flowers, and C is wrong;

d. If the safflower gene is a recessive gene, and the relevant somatic cells have dominant mutations, it may bloom white flowers, d is wrong

Therefore, b