Semester Review Life Science 4: Question Preview (ID: 14968)


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A mating between a purebred purple-flowered pea plant and a purebred white-flowered pea plant would produce a(n) ______.
a) purebred variety b) F2 generation c) hybrid d) P generation
Alleles are described as ______.
a) environmental factors that affect gene expression b) homologous chromosomes c) alternate phenotypes d) alternate versions of a gene
A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds. The seeds of all of the offspring are yellow. Why?
a) All of the offspring are homozygous yellow. b) The yellow allele is dominant to the green allele. c) The yellow allele is recessive to the green allele. d) The alleles are codominant.
Mendel crossed purebred purple-flowered plants with purebred white-flowered plants, and all of the resulting offspring produced purple flowers. The offspring are all ______,
a) heterozygotes... recessive b) heterozygotes... dominant c) homozygotes... dominant d) homozygotes... recessive
What name is given to the collection of physical traits exhibited by an organism?
a) genotype b) phenotype c) holotype d) morphology
What is the probability of having offspring with recessive attached earlobes if one parent has attached earlobes & the other is heterozygous for free earlobe?
a) 50 % b) 0% c) 75% d) 25%
In humans, the presence or absence of dimples is a trait controlled by a single gene. What is the genotype of an individual who is heterozygous for dimples?
a) Dd b) DD c) DI d) dd
An individual who is homozygous ______.
a) expresses the dominant trait b) expresses the recessive trait c) carries two copies of the same allele for a gene d) carries two different alleles for a gene
A couple has two female children. What is the probability that their next child will be male?
a) 50% b) 25% c) 33% d) 67%
Some individuals have a widow's peak which is dominant (W = dominant allele and w = recessive allele). If Janice has a widow's peak, what is her genotype?
a) WW b) WW or Ww c) ww d) Ww
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