Ch.15 - Chromosomal Theory of InheritanceSee all chapters
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Ch.1 - Introduction to Biology
Ch.2 - Chemistry
Ch.3 - Water
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Ch.6 - Cells
Ch.7 - The Membrane
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Ch.12 - Cell Division
Ch.13 - Meiosis
Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
Ch.16 - DNA Synthesis
Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
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Ch.55 - Conservation Biology

Chromosome Abnormalities and Non-Mendelian Inheritance

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Concept #1: Chromosomal Abnormalities

Concept #2: Non-Mendelian Inheritance

Additional Problems
In most mammals the DNA found in mitochondria is inherited from: a. The father onlyb. The mother and fatherc. Neither parentd. The mother only
For a plant to produce diploid sperm and egg ____ must occur during _____. a. Non-disjunction, mitosisb. Independent assortment, meiosisc. Non-disjunction, meiosisd. Independent assortment, mitosise. Independent assortment, fertilization
If a diploid sperm fertilizes a diploid egg it will produce a ____ zygote. a. Triploidb. Tetraploidc. Diploidd. Haploid 
In humans, the egg provides the mitochondria to the zygote. In plants which organelles would be provided by the egg and not by the sperm?  a. Mitochondria b. Chloroplasts c. Nuclei d. Chloroplasts and mitochondria e. Nuclei and chloroplasts
Seeing a Barr body in the nucleus of a human cell suggests that the cell was derived from:A. a normal male.B. a normal female.C. a Turner syndrome female.D. a Down syndrome male.E. None of the answers listed above are correct.
What information about recombination frequencies enables scientists to create linkage maps?A. The recombination frequency between two genes is equal to the distance in nanometers between the two genes.B. The higher the recombination frequency, the closer two genes are on a chromosome.C. The higher the recombination frequency, the farther apart two genes are on a chromosome.D. The recombination frequency between two genes reveals the nucleotide sequence of the two genes.
A mutation results in a triploid (three sets of chromosomes). Which of the following most likely led to the creation of a triploid cell?A. The homologous chromosomes in the zygote did not separate into meiosis.B. The homologous chromosomes in both the sperm and the egg did not separate during meiosis.C. The homologous chromosomes in either the sperm or egg cell did not separate during meiosis.D. The homologous chromosomes in the zygote did not separate during mitosis.
Imagine that a human primary oocyte undergoes the first meiotic division but experiences a nondisjunction event such that both copies of chromosome 7 are transmitted to the first polar body and neither are inherited by the secondary oocyte. Oogenesis is then completed and the resulting egg is fertilized by a healthy sperm with normal chromosomal content. a. How many chromosomes will be present in the resulting zygote?b. Would you describe this zygote as haploid, diploid, polyploid, or aneuploid? c. Would you expect this nondisjunction event to result in substantial phenotypic effects on the resulting offspring or would the outcome be more or less the same as if the nondisjunction event had not occurred?
Males have a higher likelihood of being colorblind due to the condition being X-linked, and their only having one possible copy of that gene. Females, on the other hand, are XX and thus have two alleles for that gene, so that they are less likely to be affected However, some females can still be affected if they are heterozygous for the trait. Why would this occur?
Why do calculations of recombination frequencies between loci that are far apart on chromosomes underestimate the true genetic distance between the loci?A. Chromosomes are much longer than the maximum possible genetic distance of 50 map units.B. There is an increased probability of double crossover events with increasing distance, such that a gamete can maintain the parental genotype after many recombination events.C. Recombination rates are uniform across a chromosome, so genetic distances can be expressed as a proportion of the chromosome's physical length.D. Two genes can exhibit a maximum recombination of 50%, so they can only be a maximum of 50 map units apart.
For the following two pedigrees, describe what you think is the most likely inheritance pattern (autosomal dominant vs. autosomal recessive). Explain your reasoning. Remember that filled (black) symbols indicate affected individuals.
If nondisjunction occurs in meiosis II during gametogenesis, what will be the result at the completion of meiosis?A. Two gametes will be n + 1 and two will be n - 1B. One gamete will be n + 1, one will be n - 1, and two will be nC. There will be three extra gametesD. All the gametes will be diploidE. Two of the four gametes will be haploid and two will be diploid
If genes A and B are linked and separated by 14 map units, what percent of the progeny produced in a testcross will be parental?
If a cell has a diploid number of 10 (2n=10), how many chromosomes will be in each of the four daughter cells if one pair of the chromosomes experiences nondisjunction during meiosis I?A. There will be two cells with 5 chromosomes and two cells without any chromosomes.B. There will be two cells with 5 chromosomes, one cell with 6 chromosomes, and one cell with 4 chromosomes.C. There will be two cells with 10 chromosomes and two cells without any chromosomes.D. All four cells will have 5 chromosomes.E. There will be two cells with 4 chromosomes and two cells with 6 chromosomes.
The karyotype with the chromosomes XXXY on chromosome No.23 of humans, determines that the individual is and abnormal genetic _____.A. MaleB. Female
Consider the effects of a mutation in humans that reduces the accuracy of the meiotic divisions that give rise to gametes. What predictions can be made about a woman that is homozygous for such a mutation?A. Most of her children will be boys.B. Among her children, the frequency of Down's syndrome will be increased compared to the population as a whole.C. Her children will be taller than average.D. Among her children, the frequency of XYY male children will be increased compared to the population.E. Both answers B and D are correct.
Mary carries a mutation in her mitochondrial DNA that causes her muscles to tire quickly. She has 3 children with John, who is a world-class marathon runner. Considering those 3 children:A. All 3 are likely to be marathoners like their father.B. 2 of the 3 are likely to be marathoners like their father.C. Any male child is likely to be a marathoner like their father.D. None of the children are likely to be marathoners like their father.
Racoons have rings around their tails and a habit of washing their food in water before eating it.Suppose that both of these traits are controlled via incomplete dominance so that wide bands on the tail are BB, medium-sized bands are Bb and narrow bands are bb and that washing all food is WW, washing some food is Ww, and washing no food is ww. How many of each genotype will be in the F1 generation resulting from a cross of two raccoons that wash someof their food and have medium-sized tail bands? Assume each trait is on a different chromosome.Suggestion - work the problem in the following order:a. Write the parental crossb. Use the fork-line method to determine the gametes produced by each parent.c. Diagram a Punnet squate of this cross. Remember males go accross the top.d. Determine the genotypic ratio (genotype along with how many) of the F1 offspring.
Why are triploid organisms usually sterile?A. Three copies of each gene will cause too much expression.B. The vast majority of meiotic products will be aneuploid.C. Meiosis is impossible with more than two homologous chromosome copies.D. Many gametes will be missing one or more chromosomes.
What differentiates a true hermaphrodite from a pseudohermaphrodite? Please explain one mechanism whereby someone can become a true hermaphrodite.