DNA And Genetics (1): Question Preview (ID: 17122)

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DNA has what shape?
a) twisted ladder
b) double helix
c) spiral shaped
d) All of these are the shapes of DNA

In human reproduction, a baby -
a) Gets half of its chromosomes from the male and half from the female
b) Receives 46 chromosomes from either parent
c) Can inherit only 46 genes
d) Receives 46 chromosomes from both parents

The heredity material that controls all cellular activities is called -
a) ATP
b) Cytoplasm
c) DNA
d) Chloroplast

In guinea pigs, brown fur (B) is dominant over white fur (b). Figure out the possible outcomes if a purebred brown guinea pig is crossed with a purebred white guinea pig. What percentage of the offspring will have white fur?
a) 0%
b) 100%
c) 50%
d) 25%

What are the main components of DNA?
a) Nitrogen bases, sugar, phosphates
b) Nitrogen bases, carbon, sugars
c) Nitrogen bases, sugars, salts
d) Nitrogen bases, oxides, sugars

Size of lips, dimples, and hair color are all this kind of trait.
a) Learned
b) The same in all of the siblings.
c) Inheritable

Cloning uses DNA to make copies of living things.
a) True
b) False

TT, tt, DD, dd are all genotypes that are called
a) purebred, heterozygous
b) purebred, homozygous
c) hybrid, heterozygous
d) hybrid, homozygous

For the phenotype, A tall head (T) is dominant to short (t), what are the possible genotypes?
a) Tall = TT Short = tt
b) Tall = TT, Tt Short = tt
c) Tall = tt Short = TT, Tt

What is an allele whose trait always shows up in an organism when it is present?
a) Hybrid
b) Purebred
c) Recessive
d) Dominant

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