Download AP Biology Review for Chapter 15 – Questions 15.1 1. Cytology and

AP Biology Review for Chapter 15 – Questions
15.1
1. Cytology and genetics converged when biologists began to see parallels between ______________
and ____________ during sexual life cycles.
2. Describe how the results of Mendel’s dihybrid crosses correlate with the behavior of chromosomes
during meiosis.
3. True or False: Morgan chose garden peas for his genetic studies because varieties were available.
4. What notation did Morgan and his students invent for symbolizing alleles in Drosophila?
5. Morgan’s finding of the correlation between a particular trait and individual’s sex supported…
a. the law of independent assortment
b. the law of segregation
c. the chromosome theory of inheritance
d. the theory of evolution
6. Why did Morgan choose fruit flies?
7. The phenotype for a character most commonly observed in the natural populations is called_____?
8. Morgan mated his white-eyed male fly with
a) Red eye female
b) white eyed female
9. True or false, the white eyed traits showed up in only fales?
10. What did morgan’s work indicate about genes located on the sex chromosome?
11. How was Morgan’s mutant physically different from the wild type of the flies?
15.2
12. The inactive X in each cell of a female condenses into a compact obejected called _______________.
A) Sex-linked gene
B) Barr Body
C) Zygote
13. In how many categories does sperm fall into?
14. What is Hemophilia? Is it autosomal or sex-linked?
15. Multiple copies of the _____ product of this gene apparently attach to the ___ chromosome on
which they are made, almost covering it.
16. True or False? The X chromosome is much smaller than the Y chromosome.
17. Because males only have one locus, the term heterozygous and homozygous lack meaning for
describing their sex-linked genes, the term_________________ is used in such cases.
18. True or False Duchenne muscular dystrophy is a sex linked recessive disorder defined by the absence
of one or more of the proteins required for blood clotting.
19. If a female is heterozygous for one trait…
a. all of her cells express one allele
b. half of her cells express one allele and the other half express the other allele
c. all of her cells express two alleles
d. half of her cells express two alleles and the other half express nothing
20. What is a Barr body?
21. How does inactivation occur?
22. In _________ , the sex of an offspring depends on whether the _______ cell contains an __
chromosome or a ___.
23. If s sex linked trait is due to a recessive allele, a female will express the phenotype only if she is a
homozygote. Because males have only one locus, the terms “Homozygous” and “Heterozygous” lack
meaning for describing their sex-linked genes. What term is used in such cases?
a. Hetrozygous
b. Hemizygous
c. Homonzygous
d. Semizygous
24. Sex-Linked genes refer to two or more genes on the same chromosome that tend to be inherited
together
True
False
25. A number of sex linked disorders are much more serious than color-blindness. Name two, and how
they affect the human body. Refer to page 291.
26. What are the four chromosomal systems in figure 15.6 and what species do they primarily contain /
affect?
15.3
27. What is the difference between recombinant types and parental types?
28. When 50% of all offspring are recombinants, geneticists say that there is a 70% frequency of
recombination. True or False?- fix the answer to make it true
15.4
29. List and describe the four alterations of chromosome structure that result from chromosome
breakage.
30. Nondisjunction is a mishap in which members of a pair of….chromosomes do not move apart
properly during….., or …..chromatids fail to separate during…….
15.5
31. How does genomic imprinting occur and what is the result?
32. What happens to the old imprints through each generation?