Principles of Biology
Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 38, Problem 5TY
Summary Introduction

Introduction: Hormones can be defined as chemical substances that are produced in the body which regulates the action of some cells or organs. Many hormones are released by special glands such as the thyroid hormone that is formed by the thyroid gland.

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Three of the many recessive mutations in Drosophila melanogaster that affect body color, wing shape, or bristle morphology are black (b) body versus grey in wild type, dumpy (dp), obliquely truncated wings versus long wings in the male, and hooked (hk) bristles versus not hooked in the wild type.  From a cross of a dumpy female with a black and hooked male, all of the F1 were wild type for all three of the characters.  The testcross of an F1 female with a dumpy, black, hooked male gave the following results:   Trait Number of individuals Wild type 169 Black 19 Black, hooked 301 Dumpy, hooked 21 Hooked, dumpy, black 172 Dumpy, black 6 Dumpy 305 Hooked 8   Determine the order of the genes and the mapping distance between genes. Determine the coefficient of confidence for the portion of the chromosome involved in the cross. How much interference takes place in the cross?
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Genes at loci f, m, and w are linked, but their order is unknown.  The F1 heterozygotes from a cross of FFMMWW x ffmmww are test crossed.  The most frequent phenotypes in the test cross progeny will be FMW and fmw regardless of what the gene order turns out to be.  What classes of testcross progeny (phenotypes) would be least frequent if locus m is in the middle? What classes would be least frequent if locus f is in the middle? What classes would be least frequent if locus w is in the middle?
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12 Organ Systems | Roles & functions | Easy science lesson; Author: Learn Easy Science;https://www.youtube.com/watch?v=cQIU0yJ8RBg;License: Standard youtube license