Biology test #5

CROSSING OVER TAKES PLACE DURING

• PROPHASE II

• PROPHASE I

• INTERPHASE

• METAPHASE I

MEIOSIS

• REDUCES THE NUMBER OF CHROMOSOMES BY ONE HALF

• PRODUCES UNIQUE SEX CELLS-1N

• ALLOWS TRAITS TO BE PASSED TO OFFSPRING

• ALL ARE TRUE

• INCREASE GENETIC VARIATION

What is it called when a sperm and egg meet?

• meiosis
• fertilization
• cell division
• mitosis

Which process and type of resulting cells are represented?

• mitosis, gametes
• mitosis, body cells
• meiosis, gametes
• meiosis, body cells

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

What is one of the advantages, why is it better to reproduce sexually versus asexually?

• survival of the fittest
• overproduction
• genetic variation
• cloning

A human zygote should have _____ chromosomes inside.

• 46
• 23
• 92
• 64

What do experts say is the most common form of Down Syndrome?

• Trisomy 47
• Trisomy 46
• Trisomy 21
• Trisomy 23

What is this?

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