Meiosis

What is it called when a sperm and egg meet?

• meiosis
• fertilization
• cell division
• mitosis

The chromosomes that pair up during meiosis, are called __________ chromosomes.  

• homozygous 
• asexual
• homologous
• genes

A male shark has 40 chromosomes in each of its sex cells. How many would be present in its body cells?

• 20
• 40
• 80
• 160

Which letter(s) in the diagram correspond to cells that are haploid? 

• A
• B
• C
• A and B

What causes genetic variation in meiosis?

• chromosomes lining up
• crossing over of chromosomes
• separation of chromosomes
• chromosomes pulling apart

Crossing over helps promote 

• male genotype
• genetic variation
• DNA replication
• mitosis

A human zygote should have _____ chromosomes inside.

• 46
• 23
• 92
• 64

Females have ____ and males have _____ chromosomes.

• XX, XY
• XY, XX
• XX, XX
• XY, XY

A human being has a somatic cell that has 46 chromosomes.  What is the haploid number found in a gamete?

• 23
• 46
• 69
• 92

What is this?

• Trisomy 13
• Monosomy 21
• 47, XXY
• Trisomy 21