[DOC] [TLE] Chromosomes Fact Sheet - National Human Genome Research ... [PAR] The only human cells that do not contain pairs of chromosomes are ... A fruit fly, 
for example, has four pairs of chromosomes, while a rice plant has ... For 
example, females who have extra copies of the X chromosome are usually taller 
than ... However, at the time, the nature and function of these cell structures were 
unclear. [DOC] [TLE] Drosophila melanogaster - Wikipedia [PAR] Drosophila melanogaster is a species of fly (the taxonomic order Diptera) in the 
family Drosophilidae. The species is known generally as the common fruit fly or 
vinegar fly. .... It has only four pairs of chromosomes: three autosomes, and one 
pair of sex ... The fly is also being used to study mechanisms underlying aging 
and... [DOC] [TLE] Mendelian Genetics: Lessons from the Fruit Fly [PAR] did not know the role of the cell nucleus, chromosomes, or DNAthey were 
discovered ... Fruit flies have several characteristics that make them excellent 
subjects for ... The total number of homologous chromosome pairs in a nucleus is 
usually ... Recessive traits are only expressed in homozygous genotypes. ...... 
Page 23... [DOC] [TLE] Chapter 1: How Genes Work: The New Genetics - National Institute ... [PAR] Mar 4, 2016 ... People have known for many years that living things inherit traits from their 
parents. .... Humans have 23 pairs of chromosomes. Male DNA... [DOC] [TLE] How many genes are in the human genome? [PAR] DNA, itself is made up of four chemical bases, pairs of which form the "rungs" of ... 
All genes are made up of stretches of these four bases (arranged in different ... 
The human genome of Homo sapiens is stored on 23 chromosome pairs. ... 
Humans though have on average three times as many kinds of proteins as the fly 
or... [DOC] [TLE] Genetics-(higher level) - LeavingBio.net [PAR] If a person has 2 dominant alleles for tallness: T T then he will be tall. ... The only 
way the recessive gene will be expressed is if he has 2 recessive .... These are 
chromosomes that pair at meiosis, have the same length and .... is a typical ratio 
of  red-eyed to  white-eyed, all of the white-eyed flies are ...... How do I know? [DOC] [TLE] What Is a Gene? - KidsHealth [PAR] Why does one kid have green eyes while another kid's eyes are brown? ... It runs 
in the family, you know. ... parents have green eyes, you might inherit the trait for 
green eyes from them. ... In humans, a cell nucleus contains 46 individual 
chromosomes or 23 pairs of ... For instance, a fruit fly cell only has four 
chromosomes! [DOC] [TLE] NOVA Online | Cracking the Code of Life | Dr. Eric Lander - PBS [PAR] Stuck to the nucleus of your cell there is I guess 23 pairs of these chains called 
chromosomes. ... The human being has 3.1 billion of these letters, not all of them 
are genes, ... If I gave you a parts list for the Boeing 777, in one sense you'd know 
a lot. ..... Yet I discover that the number of genes in a fruit fly is only about half the
... [DOC] [TLE] modENCODE | Drosophila as a model organism [PAR] The fruit fly Drosophila melanogaster has been extensively studied for over a ... 
Studying these genes in Drosophila lets scientists bypass some of the ethical 
issues ... These easily visualized chromosomes provided a road map for early 
geneticists. ... humans, which have 23 pairs of chromosomes, the fruit fly has only 
four: a... [DOC] [TLE] A Crash Course in Reptile Genetics - Reptiles Magazine [PAR] Jan 5, 2016 ... Humans have 23 pairs of chromosomes for a total of 46. Other animal species 
can far have less, such as fruit flies, which have only four pairs of chromosomes. 
... Normally, when somatic cells divide, they first replicate their DNA so that ... For 
these examples, we will use pinstripe as the dominant mutation... [DOC] [TLE] Probability and Statistics for Bioinformatics and Genetics Course Notes [PAR] May 2,

Question: Geneticists know that human beings typically have 23 pairs of these; fruit flies have only 4 pairs
Answer: chromosomes