Genetics Review 1: Question Preview (ID: 28399)

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What is an allele?
a) The genetic makeup of an organism.
b) Different forms of a gene.
c) The physical appearance of an organism.
d) A section of DNA that is located on a chromosome.

What is selective breeding?
a) The passing of traits from parents to offspring.
b) Inserting a gene from one organism into another to obtain a desired trait.
c) Breeding organisms to obtain a desired trait.
d) Reproduction that occurs from one parent.

If a cell has 40 chromosomes, how many will it have after meiosis?
a) 20
b) 40
c) 80
d) 30

What are the advantages of asexual reproduction?
a) Don't have to find a mate, takes less time, produce less offspring
b) Takes less time, produces more offspring, don't have to find a mate
c) Have to find a mate, takes more time, produces less offspring
d) Takes more time, don't have to find a mate, produces more offspring

What are the base pairing rules of DNA?
a) A pairs with C, G pairs with T
b) A pairs with T, C pairs with G
c) C pairs with A, T pairs with G

Where is DNA stored?
a) In the cytoplasm of the cell.
b) In the ribosome of the cell.
c) In the cell membrane of the cell.
d) In the nucleus of the cell.

What part of the punnett square represents the offspring?
a) All 4 boxes on the inside.
b) The top two boxes on the inside.
c) The top and sides of the square
d) The bottom two boxes on the inside

What's the difference in sex cells and body cells?
a) Body cells have half the number of chromosomes, sex cells have the same number.
b) Sex cells create identical cells, body cells do not
c) Sex cells have half the number of chromosomes, body cells have the same number
d) There is no difference.

What is the shape of DNA called?
a) Spiral
b) Twisted Ladder
c) Trapezoid
d) Double Helix

What is a dominant allele?
a) The allele that masks or covers up the recessive allele. It always shows up if it is present.
b) The same allele on different genes.
c) The genetic combination of an organism.
d) The allele that gets masked or covered up.

What are similarities between asexual and sexual reproduction
a) Both involve 1 parent
b) Both have identical offspring
c) Both pass traits from parents to offspring
d) There are no similarities

What is heredity?
a) The study of how traits are passed from parents to offspring.
b) The passing of traits from parents to offspring.
c) A type of reproduction involving 1 parent.
d) A type of reproduction involving 2 parents.

If one side of a DNA strand is AGTCCG, what would the complementary sequence on the other side be?

Brown eyes are dominant to blue eyes. If there is a 100% chance that an individual will have brown eyes, what is the genotype of the parents?
a) BB x bb
b) BB x BB
c) BB x Bb
d) All are possibilities

Homozygous purple flowers and white flowers were crossed and resulted in all purple offspring. What does this tell us about purple flowers?
a) Purple flowers are dominant over white flowers
b) White flowers are dominant over purple flowers
c) Purple and white flowers are co-dominant
d) Purple flowers are recessive

What is DNA made of?
a) Nucleotides
b) Sugars
c) Phosphates
d) Bases

What are the advantages of sexual reproduction
a) Genetically different offspring and less parental care
b) More parental care and genetically identical offspring
c) Genetically identical offspring and less parental care
d) More parental care and genetically different offspring

Who first described the principles of heredity?
a) Reginald Punnett
b) Robert Hooke
c) Gregor Mendel
d) Ms. Lightsey

A purebred green pea plant is crossed with a purebred yellow pea plant. The result is the first generation all appearing green. If 2 offspring from this first generation are crossed, what would be the probable appearance of the 2nd generation?
a) 100% Green, 0% Yellow
b) 75% Green, 25% Yellow
c) 50% Green, 50% Yellow
d) 0% Green, 100% Yellow

A homozygous tall plant is crossed with a short plant. Give all the possible phenotypes and genotypes of the offspring and t he probability of each occurring.
a) 100% Tall, 100% Tt
b) 75% Tall, 25 % Short - 25% TT, 50% Tt, 25% tt
c) 50% Tall, 50% Short - 50% TT, 50% tt
d) 100% Short - 100% tt

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