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NEL Beyond Mendel 659

17. Predictthe phenotypes of the P 1 generation.


18. If parents 1 and 2 were to have a fourth child, determine
    the probability that the child would have hemophilia.


19. If parents 1 and 2 were to have a second male, determine
    the probability that the boy would have hemophilia.

20.Predictthe genotypes of parents 4 and 5.

21.A science student hypothesizesthat dominant genes

occur with greater frequency in human populations than

recessive genes occur. Either support or refute the

student’s hypothesis, using the information that you have

gathered in this chapter tojustifyyour decision.

Chapter 19

22.Use the crossover frequencies to sketcha gene map.

23.Identify which genes are farthest apart. Determinetheir

distance. Illustrateyour answer by way of a diagram.

24.From the data provided in Table 1, concludein a written

statement the relative position of the FV, C, and Balleles.

Use the following information to answer questions 17 to 20.

Figure 3is a pedigree chart of a family in which some

members have hemophilia.

1 2

345 6

7 8 910

normal female

hemophilic female

normal male

hemophilic male

I

II

III

Figure 3

Use the following information to answer questions 22 to 24.

In 1911, Thomas Morgan collected the gene crossover

frequencies shown in Table 1while studying Drosophila

melanogaster. The loci for four different genes that code for

wing shape are located on the same chromosome. Bar-shaped

wings are indicated by the Ballele, carnation wings by the C

allele, fused veins on wings by the FVallele, and scalloped

wings by the Sallele.

Table 1

Gene combinations Recombination frequency

FV/B 2.5 %

FV/C 3.0 %

B/C 5.5 %

B/S 5.5 %

FV/S 8.0 %

DE C/S 11.0 %

DE

DE

DE

DE

DE

DE