Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Concept explainers
Question
Transcribed Image Text:7.
In sexually reproducing organisms, why are there exactly two chromosomes in each
homologous pair?
8.
Mendel's model consists of four concepts. Describe each concept in the appropriate space
below.
Mendel's Four Concepts
Description of Concept
First concept
Second concept
Third concept
Fourth concept
(law of segregation)
9.
In the third concept of Mendel's model, he explains that the
determines
the organism's appearance if the two alleles at a locus differ while the
has
no noticeable effect on the organism's appearance.
We will use shorthand to indicate dominant and recessive alleles in working genetics problems. So
many of our students make mistakes on problems because of their handwriting. Our advice is to
use uppercase block print for dominant alleles (A) and lowercase script (a) for recessive alleles.
Always begin each problem by writing out a "key" to the symbols you use. For a cross using
purple and white flowered peas, this would be:
P = purple flowers
p = white flowers
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