BIOLOGY
BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 12, Problem 5A
Summary Introduction

Introduction:

Polygenic is the inheritance pattern of a trait that is controlled by the two or more genes. Each gene may have two or more alleles. The resulting phenotype usually shows a range of value for the trait and mostly governs by additive effects of allele. For example: height, and color.

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What color are all the kernels in the F1 generation?   a. All black b. All yellow c. A mixture of black and yellow   What color kernels are dominant based on these results?   a. Black b. Yellow c. Neither   Which color is recessive based on these results?   a. Black b. Yellow c. Neither   What genotype(s) produce a black phenotype in the corn kernels? (Use "R" to represent dominant alleles, and "r" to represent recessive alleles)   a. RR b. Rr c. rr   What is/are the genotype(s) of the yellow kernels on the F2 ear?   a. RR b. Rr c. rr
You experiment with the genetics of height in a plant. You cross a homozygous tall (TT) plant with a homozygous short (tt) plant. Describe what the genotype and phenotype of the F1 progeny would look like if the plants exhibited complete dominance. Now describe the expected results if the trait exhibited incomplete dominance. What about the F2 progeny, assuming you crossed the F1 progeny with each other?
A. In corn, yellow kernels (Y) are dominant to white kernels (y). If you cross two plants with the Yy genotype, what percentage of the offspring will have yellow kernels? B.What percentage of the offspring will have the same genotype as the parent plants? C.Say you're also interested in corn plant height where tall plants (T) are dominant to short plants (t). You want to save some time and just cross your plants once. The P1 genotypes are YyTT and YYTt. Will you get any short plants with yellow kernels from this cross? Why or why not? D. If these traits, kernel color and height were linked, how would this affect your experimental outcomes? Would you expect the laws of Mendelian genetics to still apply? Why or why not ?

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