PSYC12H3 Study Guide - Quiz Guide: Mendelian Inheritance, Covalent Bond, Capillary Action

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Published on 19 Apr 2013
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Lecture 1:
Suppose primary nondisjunction occurred during oogenesis, which oocyte is affected and what are the chances that the polar body receives the extra
chromosomes?
Primary oocyte; 25%
Primary oocyte; 50%
Secondary oocyte; 25%
Secondary oocyte; 50%
Secondary oocyte; 100%
At which stage of meiosis are sister chromatids no longer held together by cohesin at the centromere?
Metaphase I
Anaphase I
Metaphase II
Anaphase II
None of the above
If "R" represents the dominant allele coding for red petals on a flower, and "r" represents the recessive allele coding for yellow petals on a flower, then an
organism with the genotype "rr" would produce what phenotypic properties? What genotypic properties would this organism have?
Red; Heterozygous
Yellow; Heterozygous
Red; Homozygous
Yellow; null
Red; null
Which of the following is true about chromosomes?
During Prophase I, a tetrad consists of 4 chromatids whereas a bivalent consists of 2 chromatids
Alleles are alternative forms of the same gene
Autosomes are responsible for determining the sex of the offspring
In one tetrad, both the chromosomes can only come from one parent
None of the above are true
What is an allele?
Another word for a gene.
A homozygous genotype.
One of several possible forms of a gene.
a heterozygous genotype.
a genetic disorder.
Which of these is FALSE about the Law of Segregation?
Two alleles of a gene segregate from one another into the gametes.
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It was created by Gregor Mendel.
Two genes segregate from one another into the gametes.
The paired alleles segregate during meiosis.
Half of the gametes carry one of the alleles and the other half of the gametes carry the second allele.
Based on the lecture material, what is or are some sources of variation that makes each individual different from one another (not including identical twins)?
The chromosomes of the mother and father undergo recombination to give unique genetic information to their offspring.
The cells of the mother and father undergo meiosis which is a reductional division to give rise to a haploid egg and a haploid sperm.
The specific combinations of the recombinant egg and sperm make each human genetically different.
All of the above are correct.
None of the above are correct.
All of the following are true of Oogenesis except the following?
As a result of each step of division two cells are produced, one of which has a higher content of cytoplasm.
Secondary oocyte contains joint sister chromatids from only one of the homologous chromosome.
Primary oocyte contains tetrads where recomnination takes place.
Meiosis precedes differentiation.
Produces a single large cell along with two or three small cells.
What is the function of the Synaptonemal Complex (SC)?
This is a complex area on the chromosomes where covalent junctions are formed between homologous chromosomes.
This is the complex which holds together sister chromatids and allows the continuation of genetic recombination between homologous chromosomes
This is a complex which holds together sister chromatids and is responsible for initiating recombination between homologous chromosomes
This is a complex that has a ladder-like structure and holds together the sister chromatids of a homologous chromosome
This is the complex also referred to as bivalent or tetrad, which holds together the sister chromatids of a homologous chromosome
Which of the following is true about chromosomes?
During Prophase I, a tetrad consists of 4 chromatids whereas a bivalent consists of 2 chromatids
Alleles are alternative forms of the same gene
Autosomes are responsible for determining the sex of the offspring
In one tetrad, both the chromosomes can only come from one parent
None of the above are true
Which of the following is an example of the law of independent assortment?
The gene for seed color segregates independently from the gene for seed shape
The gene for seed color segregates with the gene for seed shape
The gene for yellow seed color segregates independently from the gene for green seed color.
Half of the gametes for a plant with the genotype (Rr) will have the R allele and the other half of the gametes will have the r allele
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None of the above are examples of the law of independent assortment.
Genetic variation is the reason why each individual is unique. Which of the following is/are sources of variation that contribute to the formation of unique
individuals?
Meiosis is a source of variation: diploid eggs and sperm are produced.
Meiosis is a source of variation: haploid eggs and sperm are produced.
Maternal and paternal chromosomes participate in recombination.
Both a and c.
Both b and c.
A cross is performed between 2 heterozygous individuals (Bb x Bb), 4 offspring are produced. Using a punnet square cross, how many offspring will have at
least one recessive allele (ie. Bb or bb)?
1
2
3
4
It is not possible to determine this with the information given.
Which one of the following is responsible for holding two sister chromatids together?
Chiasma
Cohesin
Kinetochore
Centrosome
None of the above
According to Mendel's discovery on pea plants, his findings today show us that genetic variation within a species results from:
During the time of gamete formation, different genes undergo disjunction for different traits that assort independently.
The disjunction for the two alleles of a gene in which half of the gametes formed carry the first allele and the other half of the gametes carry the other
allele.
The non-disjunction for the two alleles of a gene in which half of the gametes formed carry the first allele and the other half of the gametes carry the
other allele.
Only A and B are true.
None of the above are true.
Which of the following is true of recombination during meiosis?
It provides a chance for the DNA to get rid of some of its base pairs to make the lengthy chromosome shorter.
Serves to alter the location of gene along the chromosome from one organism to the next.
Introduces genetic variation by providing the offspring with a different combination of alleles than what is present on either parent chromosome.
Ensures that information from homologous chromosomes of the egg is passed to the offspring without alteration.
Produces only on one cross-over intersection for gene exchange per tetrad.
Which of the following is an example of the law of independent assortment?
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Document Summary

One of several possible forms of a gene. a heterozygous genotype. a genetic disorder. Two alleles of a gene segregate from one another into the gametes. Two genes segregate from one another into the gametes. Half of the gametes carry one of the alleles and the other half of the gametes carry the second allele. The chromosomes of the mother and father undergo recombination to give unique genetic information to their offspring. The cells of the mother and father undergo meiosis which is a reductional division to give rise to a haploid egg and a haploid sperm. The specific combinations of the recombinant egg and sperm make each human genetically different. As a result of each step of division two cells are produced, one of which has a higher content of cytoplasm. Secondary oocyte contains joint sister chromatids from only one of the homologous chromosome. Primary oocyte contains tetrads where recomnination takes place.

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