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Short Answer Quiz
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1

Describe a bivalent.
2

What key ideas did Morgan elucidate from the trihybrid cross illustrated in Fig 5.3?
3

If the three genes in the cross in Fig 5.3 assorted independently, what ratio of phenotypes would you expect in the offspring of F1 males and females?
4

What are twin spots, and what causes them?
5

Who first demonstrated linkage between two genes?
6

Calculate a chi square for the results of Bateson and Punnett in Fig 5.2.
7

In an individual heterozygous for two linked genes, how many different combinations of these genes can be made in gametes if crossing over does not occur? If crossing over does occur?
8

You have identified six genes in a single linkage group in a novel plant species. You notice that a dihybrid cross between two of these genes gives you a 9:3:3:1 phenotypic ratio in the F2. Explain.
9

You hope to map three of the genes in your linkage group from the previous question. You set up the trihybrid cross as show on p. 117-118 and get the following results. Parents: tall, white flowers, nodes alternate; short, yellow flowers, nodes opposite. F1 backcrossed to homozygous recessive give the following offspring: tall, white flowers, nodes alternate 425; short, yellow flowers, nodes opposite 430; tall, white flowers, nodes opposite 2; short, yellow flowers, nodes alternate 3; tall, yellow flowers, nodes alternate 19; short, white flowers, nodes opposite 26; tall, yellow flowers, nodes opposite 46; short, white flowers, nodes alternate 49. Draw a physical map for these three genes.
10

Why would positive interference be beneficial for an organism?
11

What cytological features were used by Creighton and McClintock to identify chromosomes?





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