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Genetics (LIFE 3050) Exam 1 Questions and Answers
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Genetics (LIFE 3050) Exam 1 Questions and Answers
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Genetics (LIFE 3050) Exam 1 Questionsand Answers
What is genetics? - Answer-study of inherited variation (heredity) observed in living
organisms.
phenotypic variation - Answer-observed diversity. phenotype is particularly dictated by
genotype
nucleic acids (DNA and RNA) - Answer-hereditary material transmitted through
generations
genes - Answer-fundamental physical unit of heredity
Genetic information is packed into - Answer-chromosomes
Chromosomes stored in the cell constitute the - Answer-genome
Chromosomes in diploid cells exist in pairs called - Answer-homologous chromosomes
Mitosis - Answer-chromosomes are copied and distributed. the 2 resulting daughter
cells each receive a diploid set (2n)
Meiosis - Answer-chromosomes are copied and distributed. resulting cells receive only
half the number of chromosomes. are haploid
gametes - Answer-sex cells
mutations - Answer-produce alleles of a gene, are source of genetic variation
During meiosis, homologous pairs of chromosomes are aligned on the equatorial plate
in: - Answer-metaphase 1
Which of this cell cycle stage is the one during which DNA is replicated? - Answer-S
phase
What is the name of the structure holding sister chromatids together in a chromosome?
- Answer-centromeres
At which specific stage of meiosis do synaptonemal complexes form? - Answer-
Which cell division process is source of genetic variety in organisms? - Answer-meiosis
, A testcross is a genetic cross between: - Answer-An homozygous recessive individual &
an heterozygous or homozygous dominant individual.
Which F2 phenotypic ratios are expected from a monohybrid cross? - Answer-3:1
Which F2 genotypic ratios are expected from a monohybrid cross? - Answer-1:2:1
Which F2 phenotypic ratios are expected from a dihybrid cross? - Answer-9:3:3:1
Which F2 genotypic ratios are expected from a dihybrid cross? - Answer-
If a typical somatic cell has 32 chromosomes, how many chromosomes are expected in
each gamete of that diploid organism? - Answer-16
Incorrect models of inheritance include - Answer-blending inheritance, preformationism,
inheritance of acquired traits, pangenesis
The fundamental Mendelian process that involves the separation of contrasting genetic
elements at the same locus would be called ________. - Answer-segregation
The Chi-square test involves a statistical comparison between measured (observed)
and predicted (expected) values. One generally determines degrees of freedom as
________. - Answer-one less than the number of classes being compared
In a Chi-square analysis, the null hypothesis is rejected (fail to be accepted) when the
probability value is less than 0.05. - Answer-true
Mendel's discoveries were well received and understood by his contemporaries. -
Answer-false
The nonfunctional form of a gene is called a wild-type allele. - Answer-false
During meiosis, chromosome number reduction takes place in anaphase II. - Answer-
false
Alternative forms of a gene are called alleles. - Answer-true
Assume that you are looking at a case of lethal alleles. Crossing two green corn plants
results in 2/3 green progeny and 1/3 white progeny. If you crossed two green progeny
with each other, how many of the progeny would you predict to be green? - Answer-2/3
A child who is blood type A has a mother who is blood type B. In a paternity suit a man
is accused of being the father. He has blood type AB. Is he the father? - Answer-He
cannot be excluded as the father
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