DNA, Genetics And Evolution (5): Question Preview (ID: 17126)

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DNA is sometimes referred to as a ladder. Which two molecules make up the sides of the DNA ladder? (sugar usually ends in ose)
a) phosphate and ribose
b) phosphate and deoxyribose
c) nitrogen base and ribose
d) phosphate and nitrogen base

What is NOT an example of DNA technology currently used in agriculture?
a) The use of growth hormones produced from recombinant bacteria to increase milk production
b) The cloning of human nerve cells from corn plants
c) The development of frost resistant crop plants
d) The development of pesticide resistant crop plants

How many chromosomes are normally found in a human sex cell?
a) 46
b) 48
c) 23
d) 2000

In Deoxyribonucleic acid, Adenine pairs with the nitrogen base -
a) cytosine
b) guanine
c) thymine
d) adenine

Which would NOT represent an inherited trait?
a) Popping your knuckles
b) Dimples
c) Curly hair
d) Blue eyes

What is an organism called that has two different genes for a trait? (examples: Tt or Rr)
a) A hybrid or heterozygous
b) A purebred or homozygous
c) A mutation
d) An endangered species

Scientists have genetically engineered certain crops to be resistant to the harmful effects of pesticides. What is one advantage of this modification?
a) The crops could potentially pass this modification onto the pest, which would allow the pest to eat the crops.
b) The farmer will not kill his crops when defending them against a pest.
c) The farmer will produce crops that could be potentially harmful to human consumption.
d) The crops could have slower growing rates because of their modified genes.

What is NOT a principle of genetics?
a) Genes are usually dominant or recessive.
b) Traits are determined by gene pairs.
c) Traits are passed from parents to offspring.
d) Recessive traits always show up in the offspring.

What do we call the trait that hides or masks another trait?
a) Incomplete dominance
b) A recessive trait
c) A dominant trait
d) DNA replication

If the tall trait is dominant over the short trait, which would be used to represent the dominant trait?
a) T
b) t
c) S
d) s

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