Genetics Review

CROSSING OVER INCREASES

• LIFE SPAN

• GENETIC VARIATION

• THE NUMBER OF OFF-SPRING

• ALL ARE TRUE

CROSSING OVER TAKES PLACE DURING

• PROPHASE II

• PROPHASE I

• INTERPHASE

• METAPHASE I

FERTILIZATION OCCURS WHEN

• THE SPERM UNITES WITH THE EGG

• THE SPERM UNDERGO MEIOSIS

• THE EGG UNDERGOES MEIOSIS

• THE EGG AND SPERM UNDERGOES MEIOSIS

NORMAL HUMANS HAVE 46 CHROMOSOMES, HOW MANY WILL THE GERM CELLS HAVE AFTER MEIOSIS?

• 46

• 23

• 12

• 92

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

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

Females have ____ and males have _____ chromosomes.

• XX, XY
• XY, XX
• XX, XX
• XY, XY

What is this?

• Karyotype

• Codon Chart

• Cladogram

• Hitchhiker's Guide To The Universe

What is a phenotype

• The genetic make up (code)
• The physical trait

having two of the same genes for the trait (sometimes called purebred).

• homozygous
• hetrozygous
• protein
• chromosome