Asked by Chanelle Nichuals on Jun 19, 2024
Verified
A patient's karyotype indicates a chromosome number of 45. This result is best explained by
A) nondisjunction in either the sperm cell or oocyte.
B) nondisjunction in both the sperm cell and oocyte.
C) fertilization of a single oocyte by two sperm cells.
D) a point mutation that caused one or more chromosomes to fuse.
Nondisjunction
An error in cell division where chromosomes do not separate properly, leading to gametes with an abnormal number of chromosomes.
Karyotype
The number and appearance of chromosomes in the nucleus of a eukaryotic cell. The term is also used for the complete set of chromosomes in a species or an individual organism.
Chromosome Number
The total count of chromosomes in a cell, specific to each species and crucial for genetic information.
- Analyze the characteristics and implications of chromosomal abnormalities.
Verified Answer
KD
Karla DonaldsonJun 23, 2024
Final Answer :
A
Explanation :
Nondisjunction in either the sperm cell or oocyte can lead to an abnormal number of chromosomes, such as 45, due to the failure of chromosomes to separate properly during meiosis. This results in gametes with an abnormal chromosome number, which, when fertilized, can lead to a zygote with an abnormal chromosome count.
Learning Objectives
- Analyze the characteristics and implications of chromosomal abnormalities.