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Modern Genetic Analysis Answers to Selected Problems
Chapter 4*

5. | Horizontal lines (H) are dominant to vertical lines (h): See question

7. | Vertical line (h+) is dominant to horizontal line (h): See question

10. | Do a testcross. See question

11. | Black (B) is dominant to white (b): See question

16. | a. Autosomal recessive: affected individuals inherited the trait from unaffected parents and a daughter inherited the trait from an unaffected father. b. 1/8 See question

19. | (a). 1/8; (b). 1/4; (c). 0. See question

21. | a. Bent (B) is dominant to normal (b). b. It is X-linked. c. The Y chromosome is stated, the X is implied. See question

22.

a. and b. The "stopper" or "continuous" phenotype of the maternal parent is inherited by all its offspring. This is typical of maternal inheritance (or organelle-based inheritance) and would be expected if this trait mapped to a mitochondrial gene.

Nuclear genes that differ between the two parental strains should segregate in the normal Mendelian manner and produce 1:1 ratios in the progeny. (Remember, Neurospora is haploid, and the progeny of these crosses are the haploid products of meiosis.) This ratio is observed for the orange/yellow trait, suggesting that this trait maps to a nuclear gene.

See question

26. | H = hairy allele; h = smooth allele See question

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