Chromosomal Abnormalities and Ploidy

The video tutorial discusses chromosomal abnormalities, focusing on numerical and structural defects. It explains karyotyping, polyploidy, and aneuploidy, and their roles in birth defects and spontaneous abortions. The tutorial also covers meiosis, nondisjunction, and various structural chromosomal disorders like deletion, inversion, and translocation.

What is the primary purpose of karyotyping in the study of chromosomal abnormalities?

• To measure the length of DNA strands

• To visualize the structure and number of chromosomes

• To determine the genetic sequence of DNA

• To identify the presence of specific genes

Which term describes the number of sets of chromosomes in a biological cell?

• Phenotype

• Genotype

• Allele

• Ploidy

Which type of ploidy is characterized by having three sets of chromosomes?

• Diploid

• Triploid

• Tetraploid

• Pentaploid

What is the difference between polyploidy and aneuploidy?

• Polyploidy occurs only in plants, while aneuploidy occurs only in animals.

• Polyploidy is a type of structural abnormality, while aneuploidy is a numerical abnormality.

• Polyploidy involves changes in the number of chromosome sets, while aneuploidy involves changes in the number of individual chromosomes.

• Polyploidy involves changes in chromosome structure, while aneuploidy involves changes in chromosome number.

What is a common cause of numerical chromosomal abnormalities?

• Nondisjunction during meiosis

• Viral infection

• Gene mutation

• Environmental factors

What is the result of nondisjunction during meiosis?

• Aneuploidy

• Balanced translocation

• Gene inversion

• Polyploidy

Which of the following is NOT a type of structural chromosomal abnormality?

• Nondisjunction

• Duplication

• Inversion

• Deletion

Which structural abnormality involves a segment of a chromosome being flipped 180 degrees?

• Deletion

• Translocation

• Inversion

• Duplication

What is the term for a chromosomal abnormality where a segment is transferred between non-homologous chromosomes?

• Insertion

• Inversion

• Translocation

• Duplication

What is the term for a chromosomal abnormality where a segment is added to a chromosome from another chromosome?

• Inversion

• Insertion

• Translocation

• Duplication