1. How many sets of DNA molecules or chromosomes does a diploid organism have? 2. How many sets of DNA molecules or chromosomes does a haploid organism have? 3. Humans are (haploid or diploid) 4. How many homologous pairs of chromosomes does a human have?
1. How many sets of DNA molecules or chromosomes does a diploid organism have? 2. How many sets of DNA molecules or chromosomes does a haploid organism have? 3. Humans are (haploid or diploid) 4. How many homologous pairs of chromosomes does a human have?
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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Transcribed Image Text:Homologous Chromosomes
We have discussed homologous chromosomes before. This idea is
essential to the understanding of genetics, so we will review it again.
Information
• Very simple organisms have only one set of chromosomes and they
are haploid.
► More complex organisms have two sets of chromosomes and are
diploid.
• Haploid organisms have one of each kind of chromosome and one of
every kind of gene.
Diploid organisms have two of each kind of chromosome and two of
kind of gene.
every
The two chromosomes of each kind in a diploid organism are called
homologous chromosomes because they are carrying the same
kind of traits (genes). Homo means "same."
► A human has 23 different kinds of chromosomes that are given
numbers from 1 to 23. Because we are diploid organisms we have two
of each of the different kinds. So, we have 46 chromosomes in all, made
up of 23 homologous pairs.
? QUESTION
1. How many sets of DNA molecules or chromosomes does a diploid
organism have?
2. How many sets of DNA molecules or chromosomes does a haploid
organism have?
3. Humans are
(haploid or diploid)
4. How many homologous pairs of chromosomes does a human have?
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