Genetics Review: Question Preview (ID: 23526)


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Which type of trait is expressed (seen) only if BOTH genes code for that trait?
a) dominant b) recessive c) phenotype d) genotype
Which type of trait is always expressed (seen), even if only one gene of a pair codes for that trait?
a) dominant b) recessive c) phenotype d) genotype
___ is the physical expression of the genes (how it looks).
a) homozygous b) chromosome c) DNA d) phenotype
What do you call one gene of a pair for a SPECIFIC trait?
a) DNA b) chromosome c) allele d) heterozygous
What are the structures found in the nucleus that are made of DNA wound around proteins?
a) genes b) chromosomes c) alleles d) genotype
Which word means that the genes of a pair are different?
a) homozygous b) heterozygous c) allele d) dominant
What is a small piece of DNA that tells a cell how to express a trait?
a) dominant b) heterozygous c) chromosome d) gene
What word means that both genes of a pair are alike?
a) dominant b) recessive c) heterozygous d) homozygous
Which best represents a genotype?
a) Ab b) NNn c) Yy d) brown hair
In dogs, hearing (H) is dominant over deafness (h). If a heterozygous parent is crossed with a homozygous dog that can hear, what is the chance of having a puppy that is deaf?
a) 0% b) 25% c) 50% d) 100%
Having two different alleles for a trait is said to be ___.
a) phenotype b) dominant c) heterozygous d) purebred
What does a capital letter represent in genetics?
a) A recessive trait b) A dominant trait c) A hybrid trait d) A phenotype
Which of the following refers to a homozygous dominant trait?
a) Tt b) AB c) QQ d) rr
Which of the following refers to a trait that is heterozygous?
a) Tt b) QQ c) rr d) AB
If a buffalo has 60 chromosomes in its normal body cells, how many chromosomes will each parent contribute to its baby?
a) 60 b) 120 c) 30 d) not enough information to determine the answer
If two heterozygous parents are crossed, what percent of the offspring will show the recessive trait?
a) 25% b) 50% c) 75% d) 100%
If one parent is GG and the other is gg, what percent of the offspring will show the recessive trait?
a) 0% b) 25% c) 50% d) 75%
If Huntington's disease (H) is dominant over no disease (n), which genotypes below would have Huntington's disease?
a) all of these answers are correct b) Hh and hh c) HH and Hh d) HH and hh
Which genotypes below will show the recessive trait?
a) RR b) Rr c) rr d) none of these
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