Among the genotypes in the lower category, those with the same phenotype are:

Hello! In biology, we agree that the A (uppercase) gene is the dominant gene, and the A (lowercase letter) is the recessive gene. When A and A are present at the same time, the phenotype tends to be a dominant trait controlled by the A gene.

This means that, in general, both the AA and AA genotypes exhibit the same dominant trait, while AA (double lowercase letters) exhibit the recessive trait. Returning to this question, we can see that only two genotypes in option A can manifest as dominant traits.

Then, I'll tell you the trick. In general, the same genotype must be the same, and the same phenotype is not necessarily the same. Here, phenotype can be understood as a trait, that is, something that can be directly reached, while genotype is formed by genetic pairing, which cannot be seen directly.

In this case, a b is the genotype, and the trait they work together to manifest is the phenotype.

Do you understand? Hopefully!

The above options are indicated by the case of the letters, and the organisms are phenotypes, such as a dog's curly and straight hair are a pair of different phenotypes.

It must be A, hehe, because the two genotypes in A are the same as BB, but one is AA, and the other is AA, because A is the dominant gene, AA and AA are both dominant, and the genotype containing A is the phenotype is dominant, and the same is true for B, BB and BB are both dominant phenotypes, and usually the phenotypes of genotypes containing capital letters are dominant, dominant, and recessive, AA and BB are recessive, Recessive and dominant are two traits with different phenotypes.

A. Both dominant homozygotes (AA) and heterozygotes (AA) show dominant traits, and A is correct;

b. In the same environment, the phenotype of the same genotype is not necessarily the same, such as AA and AA, B is correct;

c. The genotype is the same, but the phenotype is not necessarily the same, like the egg twins, the elder brother is darker in the field, and the younger brother is whiter in the indoors, and C is wrong;

d. In the same environment, the genotype is the same, and the phenotype must be the same

a. The phenotype is the same, the genotype is not necessarily the same, and the genotype is correct;

b. The genotype is the same, the phenotype may be different due to different environments, and B is correct;

c. Under the same environmental conditions, the phenotype is the same, and the genotype is not necessarily the same, such as dominant homozygous and dominant heterozygous, c error;

d. From the analysis of C, it can be seen that D is correct

Therefore, c

a. Phenotype is determined by both genotype and environment, a false; Stupid group.

b. The genotype is the same, if the environment is different, the phenotype may also be different, and the wrong band is wrong;

c. Different genotypes, phenotypes may be the same, c is wrong;

d. The genotype is the same, the environment is different, and the phenotype may be different

a. The phenotype is the same, the genotype is not necessarily the same, and the genotype is correct;

b. The genotype is the same, Zheng Pei's phenotype may be different due to different environments, and B is correct;

c. Under the same environmental conditions, the phenotype is the same, and the genotype is not the same as the only definite phase, such as the dominant homozygous and the dominant heterozygous, c is wrong;

d. From the analysis of C, it can be seen that D is correct

Therefore, c

a. The phenotype is the same, but the genotype is not necessarily the same, for example, the genetic composition of the double eyelid may be AA or AA, and A is correct;

b. The genotype is the same, but the phenotype is not necessarily the same, just like the egg twins, the elder brother is darker in the field, and the younger brother is whiter in the indoors, B is wrong;

c. The phenotype of an organism is determined by the combined effect of genotype and environment, and c. Correct;

d. In the same living environment, the phenotype is the same, and the genotype is not necessarily the same, such as the genetic composition of the double eyelid may be AA or AA, and D is correct

Therefore, b

a. The phenotype is the same, the genotype is not necessarily the same, and the genotype is correct;

b. The genotype is the same, the phenotype may be different due to different environments, and B is correct;

c. Under the same environmental conditions, the phenotype is the same, and the genotype is not necessarily the same, such as dominant homozygous and dominant heterozygous, c error;

d. From the analysis of C, it can be seen that D is correct

Therefore, c

Answer C: This question mainly tests the understanding of phenotype and genotype. Genotype and phenotype belong to two different categories of concepts, but there is a certain connection between the two. Genotype refers to the sum of the genetic composition of an organism and is an intrinsic factor in the performance of traits.

The genotype is invisible to the naked eye, such as the genotype of purebred high-stemmed peas is dd, short-stemmed peas are dd, and hybrid high-stemmed peas are dd. Phenotype is the sum of all traits exhibited by a trait in a trait that refers to an organism and is the final expression of the interaction between genotype and environmental conditions. Thus, these two concepts distinguish the basis of genetic material from the science of specific traits that manifest themselves.

The relationship between genotype and phenotype is more complex, the phenotype is the same, the genotype is not necessarily the same, and Celery DD and DD are both tall stemmed peas. Since not all of the phenotypic effects of the genotype can be expressed in the same environmental conditions, individuals with the same genotype can only have the same phenotype when the environmental conditions are the same. It has been proved that whether the trait controlled by the dominant recessive gene can be expressed is closely related to the environmental and physiological conditions (age, gender, nutrition, etc.) of the trait development.

Answer B: This question requires students to carefully review the question and identify the wrong narrative on the basis of understanding the relationship between genotype and phenotype. Genotype is made up of genes for phenotype, which is the trait that an organism exhibits, which is the result of the interaction between genotype and environment. It is wrong to say that the genotype is the same and the phenotype must be the same without considering whether the environment is the same.

When it is determined that the environment is the same, the genotype is the same, and the phenotype is the same. Conversely, the phenotypic quarrel is the same, and it cannot be determined that the genotype is the same, regardless of whether the environment is the same or not. Because genes have a dominant recessive relationship, when the phenotype is a dominant trait, its genotype can be homozygous or heterozygous.

For example, there are two genotypes of pea tall stem traits: DD and DD.

Answers: Both ACC and CC showed dominant traits and showed the same traits. Circular aberration cc showed dominant traits, while cc showed recessive traits and showed different traits. c and d are non-allelic genes, which control different traits and exhibit different traits; CC is a dominant trait, while CC is recessive, showing different traits. Crack and therefore choose a for this question.