Crossing Over/Nondisjunction

What is the primary cause of genetic variation during meiosis?

• chromosomes lining up

• "crossing over" of chromosomes

• separation of chromosomes

• chromosomes pulling apart

Tags

NGSS.HS-LS3-2

The process of "crossing over" occurs in what phase of meiosis?

• anaphase 1

• prophase 1

• prophase 2

• telophase 2

Tags

NGSS.HS-LS3-2

A pair of identical chromosomes (one inherited from mom and one inherited from dad) are called ______________________________.

• sister chromotids

• centromeres

• homologous chromosomes

• autosomes

Tags

NGSS.HS-LS3-1

The failure of one or more pairs of homologous chromosomes or sister chromatids to separate "normally" during meiosis is called _____________________.

• nondisjunction

• anaphase I

• nondiploidy

• karyotype

Tags

NGSS.HS-LS3-2

• This karyotype shows Trisomy 21
• This karyotype has no abnormality
• This karyotype is missing a sex chromosome (monosomy x)
• This karyotype is from a gamete

Tags

NGSS.HS-LS3-2

Based on the Karyotype shown, at which chromosome pair can we identify a genetic disorder? 

• Chromosome pair 5
• sex chromosomes
• Chromosome pair 21
• There are no chromosomal disorders

Which statement is NOT true about Karyotypes

• Chromosomes (pairs 1-22) are arranged by size
• Sex chromosomes are found at the end
• A normal karyotype has 46 chromosomes or 23 pairs
• Having missing or extra chromosomes does not indicate a disorder

What is the chromosomal condition of the individual whose karyotype is seen in the image?

• Monosomy X (Turner's Syndrome)
• Trisomy 21 (Down's Syndrome)
• Trisomy 13 (Patau Syndrome)
• Trisomy 18 (Edwards's Syndrome)

A pair of identical chromosomes shown in a karyotype, one inherited from mom, and one inherited from dad are called

• sister chromotids
• centromeres
• homologous chromosomes
• autosomes

Tags

NGSS.HS-LS3-1

Nondisjunction can result in 

• trisomy conditions
• monosomy conditions
• additional sex chromosomes
• all of these

Tags

NGSS.HS-LS3-2