Genetics: Question Preview (ID: 156)


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The different forms of a gene are called
a) alleles. b) phenotypes. c) genotypes. d) chromosomes.
Mutations in body cells (not gametes) are passed on to offspring.
a) True b) False c) d)
The order of the nitrogen bases along a gene forms a genetic code that specifies what type of protein will be produced.
a) True b) False c) d)
The scientific study of heredity is called
a) biology. b) biochemistry. c) cytology. d) genetics.
During protein synthesis, messenger RNA
a) links one amino acid to another. b) releases the completed protein chain. c) provides a code from DNA in the nucleus. d) carries amino acids to the ribosome.
An organism with two identical alleles for a trait is
a) heterozygous. b) homozygous. c) recessive. d) dominant.
An example of a hybrid genotype would be
a) Gg. b) GG. c) gg or GG. d) Widow's peak.
According to the chromosome theory of inheritance, genes are carried from parents to offspring on
a) DNA. b) RNA. c) chromosomes. d) alleles.
In a dihybrid cross, two hybrid organisms produce offspring. What % of the offspring would be expected to be homozygous recessive?
a) 100% b) 75% c) 50% d) 25%
DNA has chemicals called bases. So does RNA. Which of the following is true?
a) Guanine pairs with thymine. b) DNA has the base uracil. c) Thymine pairs with cytosine. d) Adenine pairs with uracil in RNA.
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