Meiosis and intro to Genetics

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

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NGSS.HS-LS3-2

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

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NGSS.HS-LS3-1

Compared to the number of chromosomes contained in a body cell, how many chromosomes would normally be contained in a gamete?

• The same number
• One-fourth as many
• Twice as many
• Half as many

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NGSS.HS-LS3-2

What causes genetic variation in meiosis?

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

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NGSS.HS-LS3-2

Crossing over helps promote 

• male genotype
• genetic variation
• DNA replication
• mitosis

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NGSS.HS-LS3-2

NGSS.HS-LS4-2

Females have ____ and males have _____ chromosomes.

• XX, XY
• XY, XX
• XX, XX
• XY, XY

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NGSS.HS-LS3-1

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

• 23
• 46
• 69
• 92

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NGSS.HS-LS3-2

Diploid Cells are represented by

• 2n
• n
• 4n
• 1/2 n

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NGSS.HS-LS3-2

A human usually has ______ chromosomes in their body cells.

• 6
• 22
• 4
• 46

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NGSS.HS-LS3-1