Multiple Choice
What is the primary purpose of crossing over during meiosis?
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12. Meiosis
Genetic Variation During Meiosis
Multiple Choice
An individual has one extra complete set of chromosomes. What is this condition called?
A
Trisomy
B
Monosomy
C
Polyploidy
D
Aneuploidy
Verified step by step guidance1
Understand the basic definitions: Chromosomes are structures within cells that contain DNA. Humans typically have 23 pairs of chromosomes, making a total of 46.
Learn about chromosome number variations: Normally, each species has a characteristic number of chromosomes. Variations can occur, leading to conditions such as trisomy, monosomy, aneuploidy, and polyploidy.
Define trisomy: Trisomy is a condition where there is an extra chromosome in one of the pairs, resulting in three chromosomes instead of the usual two in a pair. An example is Down syndrome, which is trisomy 21.
Define monosomy: Monosomy is a condition where one chromosome from a pair is missing, resulting in only one chromosome instead of the usual two in a pair.
Define polyploidy: Polyploidy is a condition where an individual has one or more extra complete sets of chromosomes. This is different from aneuploidy, which involves an abnormal number of chromosomes but not complete sets.
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