Genetics Review Question Preview (ID: 23526)


Questions To Help Prepare For The Genetics Test. TEACHERS: click here for quick copy question ID numbers.

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 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

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

What does a capital letter represent in genetics?
a) A recessive trait
b) A dominant trait
c) A hybrid trait
d) A phenotype

Having two different alleles for a trait is said to be ___.
a) phenotype
b) dominant
c) heterozygous
d) purebred

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%

What word means that both genes of a pair are alike?
a) dominant
b) recessive
c) heterozygous
d) homozygous

What is a small piece of DNA that tells a cell how to express a trait?
a) dominant
b) heterozygous
c) chromosome
d) gene

Which word means that the genes of a pair are different?
a) homozygous
b) heterozygous
c) allele
d) dominant

What are the structures found in the nucleus that are made of DNA wound around proteins?
a) genes
b) chromosomes
c) alleles
d) genotype

What do you call one gene of a pair for a SPECIFIC trait?
a) DNA
b) chromosome
c) allele
d) heterozygous

___ is the physical expression of the genes (how it looks).
a) homozygous
b) chromosome
c) DNA
d) phenotype

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

Which type of trait is expressed (seen) only if BOTH genes code for that trait?
a) dominant
b) recessive
c) phenotype
d) genotype

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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