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Short Answer Quiz
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1

Give three examples of types of genetic variation.
2

In addition to size, what features can be used to distinguish chromosomes on a karyotype?
3

What information can be gathered from a karyotype?
4

Describe an interstitial deficiency.
5

Why do you think chromosomal deficiencies tend to produce syndromes with complicated patterns of symptoms?
6

What is the result of a misaligned crossover during recombination?
7

Why must the flies shown in Fig 8.6 all be female?
8

What consideration would you need to include in a prediction of the number of facets in a hemizygous male fly carrying the Bar or Ultra-bar alleles?
9

Why might inversions occasionally have significant effects on the individual?
10

Which type of inversion is likely to generate the most highly abnormal gametes, and why?
11

What will happen to an offspring produced by a dicentric chromosome?
12

What are two mechanisms that can generate a reciprocal translocation?
13

Differentiate between a balanced and an unbalanced chromosomal rearrangement.
14

Describe a position effect.
15

What type of chromosomal rearrangement is the most common in humans?
16

What is a translocation cross?
17

Differentiate between triploid and trisomic.
18

If 5-10% of fertilized human eggs contain an abnormality in chromosome number, how do you explain the statistic that only about 1% of human births contains an abnormality in chromosome number?
19

Why does aneuploidy for the sex chromosomes in humans have a milder effect than other aneuploidies?
20

How might a tetraploid species come into existence?
21

Why would a triploid species be unlikely to be viable?
22

Describe endopolyploidy.
23

How would a karyotype prepared from a Drosophila salivary gland differ from that shown in Fig 8.1?





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