Genetic Analysis: An Integrated Approach (3rd Edition)
Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 5, Problem 13P

Researchers cross a corn plant that is pure - breeding forthe dominant traits colored aleurone ( C1 ), full kernel ( Sh ),and waxy endosperm ( Wx ) to a pure-breeding plant with

the recessive traits colorless aleurone ( c1 ), shrunken kernel( sh ), and starchy ( wx ). The resulting F1 plants were crossedto pure-breeding colorless, shrunken, starchy plants.

Counting the kernels from about 30 ears of corn yields thefollowing data.

K e r n e l P h e n o t y p e N u m b e r C o l o r e d , s h r u n k e n , s t a r c h y 116 C o l o r e d , f u l l , s t a r c h y 601 C o l o r e d , f u l l , w a x y 2538 C o l o r e d , s h r u n k e n , w a x y 4 c o l o r l e s s , s h r u n k e n , s t a r c h y 2708 c o l o r l e s s , f u l l , s t a r c h y 2 c o l o r l e s s , f u l l , w a x y 113 c o l o r l e s s , s h r u n k e n , w a x y 626 6708

a. Why are these data consistent with genetic linkageamong the three genes?

b. Perform a chi-square test to determine if these datashow significant deviation from the expected phenotype distribution.

c. What is the order of these genes in corn?

d. Calculate the recombination fraction between the genepairs.

e. What is the interference value for this data set?

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In corn, a triple heterozygote was obtained carrying themutant alleles s (shrunken), w (white aleurone), andy (waxy endosperm), all paired with their normal wildtype alleles. This triple heterozygote was testcrossed, andthe progeny contained 116 shrunken, white; 4 fully wildtype; 2538 shrunken; 601 shrunken, waxy; 626 white;2708 white, waxy; 2 shrunken, white, waxy; and 113 waxy.a. Determine if any of these three loci are linked and,if so, show map distances.b. Show the allele arrangement on the chromosomesof the triple heterozygote used in the testcross.c. Calculate interference, if appropriate.
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Genetic Analysis: An Integrated Approach (3rd Edition)

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