BÀi 6 - ĐỀ 2

Explanation
The given correct answer AABB indicates that the species has two sets of chromosomes, with each set consisting of two chromosomes. The first set is represented by the symbol A, and the second set is represented by the symbol B. Therefore, AABB represents a diploid organism with two sets of chromosomes, each set being homozygous for a specific trait.

Explanation
The given correct answer states that the multiple alleles of the first species are represented by AAAA and BBBB. This suggests that the first species has two sets of identical alleles, with each set consisting of four A alleles or four B alleles. This indicates that the first species is homozygous for both A and B alleles, resulting in the formation of AAAA and BBBB genotypes.

Explanation
The given correct answer AABB represents the genotype of the species with a tetraploid condition. In this case, each individual has two copies of each chromosome, denoted by A and B. Therefore, the genotype AABB indicates that there are two sets of chromosomes, with each set containing two copies of both A and B chromosomes.

Explanation
The correct answer is 10 because in a species with a diploid number of 2n=8, each gamete will have n=4 chromosomes. In a triploid individual (3n), there will be a total of 3 sets of chromosomes, so 3n=12. However, since the question asks for the number of chromosomes in a "duplicated" (double) set, we divide 12 by 2, resulting in 6. Adding this to the original 2n=8, we get a total of 10 chromosomes in the duplicated set in a triploid individual.

Explanation
The given question is asking for the number of chromosomes that can be predicted in the tetraploid form of a species with a diploid number of 12. In tetraploidy, the chromosome number is four times the diploid number. Therefore, the correct answer is 24 chromosomes.

Explanation
The given question is asking for the number of chromosomes that can be predicted in a triploid organism with a double set of chromosomes. In this case, the organism has 2n = 4, meaning it has a diploid number of 4 chromosomes. A triploid organism has three sets of chromosomes, so we need to multiply the diploid number by 3. Therefore, the number of chromosomes that can be predicted in the triploid organism is 4 x 3 = 12.

Explanation
The correct answer is 18. In a species with a diploid chromosome number of 2n = 12, the number of chromosomes in triploid cells can be calculated by multiplying the diploid number by 3. Therefore, 2n = 12 x 3 = 36 chromosomes in triploid cells.

Explanation
The correct answer is 48. This is because the question states that the species has a diploid chromosome number of 2n = 24. In a tetraploid organism, the chromosome number is four times the haploid number. Therefore, in this species, the number of chromosomes in the tetraploid condition would be 4 x 24 = 96.

Explanation
The correct answer is "thể một (2n-1)". This is because in humans, Turner syndrome is characterized by a missing or incomplete X chromosome, resulting in a karyotype of 45,X or 45,X0. The "2n-1" notation refers to the number of chromosomes in a non-diploid cell, where "2n" represents the normal diploid number of chromosomes in humans (46). Therefore, the correct answer indicates that Turner syndrome is a form of chromosomal mutation with a karyotype of 45,X or 45,X0, which is one less than the normal diploid number.

Explanation
The correct answer is "Hội chứng 3X, hội chứng Tơcnơ." This is because the question states that some diseases and genetic syndromes only occur in females and not in males. Out of the given options, "Hội chứng 3X" and "hội chứng Tơcnơ" are the only ones that fit this criteria.