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- 1. Multiple ChoiceThe crossover frequency between genes E and F is 6%, between E and G is 10% and
between F and G is 4%. What is the correct order of the genes on a chromosome?E - F - GF - E - GF - G - EE - G - F - 2. Multiple Choice
In Drosophila, the genes for eye colour (pr), wing shape (vg), and body colour (eb) are all found on the same chromosome. The following crossover frequencies for these genes were determined by experimentation. Determine the sequence of genes on the chromosome.eb - vg - prvg - eb - prvg - pr - ebpr- vg - eb - 3. Multiple ChoiceIf a normal woman carrying the recessive sex linked gene for color blindness marries a normal male, what percentage of their sons will be color blind?0%25%50%100%
- 4. Multiple ChoiceBaldness is a recessive sex-linked trait. If a normal headed woman, whose father is bald, has children with a normal headed man, then which of the following would be true regarding their offspring?50% chance of a female with baldness100% chance of a male with baldness50% chance of offspring with baldness50% chance male offspring will be bald
- 5. Multiple ChoiceIn 1911, Thomas Morgan collected the following crossover gene frequencies while studying Drosophila. Bar-shaped eyes are indicated by the B allele, and carnation eyes are indicated by the allele C. Fused veins on wings (FV) and scalloped wings (S) are also located on the same chromosome. What would be the gene map?C - B - FV - SFV - S - B - SC - FV - B - SC - B - S - FV
- 6. Multiple ChoiceIn humans, hemophilia is a sex linked recessive trait. Females can be normal, carriers, or have the disease. Males will either have the disease or not (but they won’t ever be carriers). A woman who is a carrier marries a normal man. What is the probability that their children will have hemophilia?0%25%50%100%
- 7. Multiple ChoiceSex determination in mammals is determined by the ______ in the _______ chromosome.SRY gene; XSRY gene; YHERC2; 15BRCA1; 6
- 8. Multiple ChoiceWhich of the following distances between linked genes would have the greatest chances of crossing over?22 map units10 map units15 map units2 map units
- 9. Multiple ChoiceWhat would we expect to happen in a test cross which involved genes that were closely linked?There would be a higher frequency of recombination.The offspring would show more individuals that represented the parents.The offspring would less individuals that represented the parents.The genes would assort themselves as if they were on separate chromosomes.
- 10. Multiple ChoiceWhich of the following statements is correct regarding aneuploidies.A person with an extra X chromosome would have more severe conditions than a person with an extra 21st chromosomeChromosomal abnormalities involving nondisjunction are fairly common.People with Turner's Syndrome (X0) don't tend to survive to adulthood.The chances of nondisjunction during meiosis increases with age.
- 11. Multiple ChoiceA woman who is a carrier of an X-linked recessive trait will have a ______ chance of passing that trait to her sons.0%50%25%100%
- 12. Multiple ChoiceA man who is an achondroplastic dwarf decides to have a child with a woman who does not share the condition. They end up having 3 sons who are all normal and 3 daughters who are all achondroplastic dwarfs. Which of the following is most likely true regarding achondroplastic dwarfism in order for this to occur.Achondroplastic dwarfism is a Y-linked dominant trait.Achondroplastic dwarfism is an X-linked dominant traitAchondroplastic dwarfism is an X-linked recessive traitAchondroplastic dwarfism results from a chromosomal translocation.
- 13. Multiple ChoiceRed-green colorblindness is a sex-linked recessive condition in humans. If a woman with colorblindness marries a man who is normal, then what are the chances their daughter will have colorblindness? What about their sons?daughters - 50%
sons - 50%daughters - 100%
sons - 100%daughters - 0%
sons - 100%daughters - 50%
sons - 0% - 14. Multiple ChoiceIn cats, black fur color is caused by an X-linked allele; the other allele at this locus causes orange 2) color. The heterozygote is tortoiseshell. Which of the following would you not expect from the cross of a black male and a tortoiseshell female?black femalesorange femalestortoiseshell femalesorange males
- 15. Multiple ChoiceIn cats, black fur color is caused by an X-linked allele; the other allele at this locus causes orange 2) color. The heterozygote is tortoiseshell. What is the chance that a black female and an orange male would produce tortoiseshell offspring?0%25%50%100%
- 16. Multiple Choice
Why did Morgan choose fruit flies as a model organism?
short life cycle
few offspring
little genetic variation
large chromosome count
- 17. Multiple Choice
True/False: Genes that are found on the same chromosome are less likely to segregate/independently assort from one another.
True
False
- 18. Multiple Choice
When does recombination first occur in meiosis?
prophase I
prophase II
metaphase I
metaphase II
- 19. Multiple Choice
Genomic imprinting occurs when a gene is silenced based on the presence or absence of
an inversion mutation in one of the sex chromosomes
a methyl group attached to cysteine nucleotides
histone proteins
carboxyl group attached to adenine nucleotides
- 20. Multiple Choice
If you cross a white-eyed female drosophila with a red eyed male drosophila, what will be the colour of eyes for their male and female offspring?
Both red eyed
Both white eyed
Red eyed daughter and white eyed son
Red eyed son and white eyed daughter
- 21. Multiple Choice
Linkages result in ___
Formation of more dominant phenotype
Formation of wilder phenotype
Formation of more parental phenotype
Formation of more recombinant phenotype
- 22. Multiple Choice
What was the first "mutant" discovered by Morgan?
male with red eyes
male with white eyes
female with red eyes
female with white eyes
- 23. Multiple Choice
Which of the following chromosome combinations will result in a female in humans?
XY
X
XX
YY
- 24. Multiple Choice
Which of the following best describes having either one extra or one less chromosome?
hapaploidy
polyploidy
diploidy
aneuploidy
- 25. Multiple Choice
Which of the following best describes having more than two sets of chromosomes?
hapaploidy
diploidy
polyploidy
aneuploidy
- 26. Multiple Choice
If the distance between A/B is 0.12 mu and gene C is on the opposite side of A with respect to B at a distance of 0.23 mu, Which is the central gene in this map
A
B
C
Data insufficient
- 27. Multiple Choice1 map unit is equal to:1 nm1% recombination1 chromosome1 mutation
- 28. Multiple ChoiceGene A, B, and C are on the same chromosome. Gene A separates from gene B 15% of the time and gene B separates from gene C 2% of the time. How far apart are genes A and C in gene map?2 map units15 map units17 map units30 map units
- 29. Multiple ChoiceGene A, B, and C are on the same chromosome. Gene A separates from gene B 15% of the time and gene B separates from gene C 2% of the time. Which genes are most likely linked?A - BB - CA - Cnone of the above
- 30. Multiple ChoiceIf an organism's haploid (n) number is 5, what is the number of chromosomes in the somatic cells (diploid 2n)?5101520
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