EBK BIOLOGY
EBK BIOLOGY
6th Edition
ISBN: 9780134819150
Author: Maier
Publisher: VST
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Chapter 8, Problem 3AAATB
Summary Introduction

To determine:

The pedigree of mating between the first cousins.

The reason for mating between relatives can cause offspring to have recessive disorder.

Introduction:

In recessive disorder, two copies of abnormal gene are passed on to the off spring from the parents. Such diseases are, cystic fibrosis, sickle cell anemia, and tay-sachs disease. The pedigree analysis gives us the idea about the genetic makeup of our ancestors and future generation for a particular trait.

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IN TRANSYLVANIA, SOME PEOPLE EXHIBIT TWO UNUSUAL TRAITS IN WHICH THEY HAVE VERY LONG FRONT TEETH AND THE INABILITY TO BE AWAKE WHEN THE SUN IS UP. BOTH OF THESE TRAITS APPEAR TO BE RECESSIVE. IF A WOMAN WHO IS HETEROZYGOUS FOR TEETH AND HOMOZYGOUS NORMAL FOR BEING IN THE SUN MARRIES A MAN WHO HAS BOTH THESE TRAITS, WHAT COULD BE THE PHENOTYPES AND GENOTYPES OF THEIR CHILDREN? USE A PUNNET SQUARE AND SHOW ALL WORK. LIST THE RATIOS FOR THE GENOTYPES AND PHENOTYPES.
As you have read, if an allele is paired with another one just like it, the name for the pair is homozygous. If the allele is paired with a different type, the pair is called heterozygous. You have also learned about how some alleles are domi- nant and some are recessive. A Punnett square shows how the pairs will possi- bly match up. Making a prediction about how the offspring will look is usually simple. If the pair is heterozygous or homozygous dominant, the dominant trait will be expressed. If the pair is homozygous recessive, the recessive trait will be expressed. There are some alleles, however, that behave like normal dominant alleles when in a heterozygous pair, but are deadly in a homozygous pair. For example, the alleles that control fur color in wild mice are yellow and black. The yellow allele is dominant (Y) and the black is recessive (b). When a mating occurs and the alleles are paired together, the hairs have yellow and black bands. From a distance this makes the mouse…
Give possible sources of phenotypic variation and explain how these variations are inherited from one generation to another.
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