bio 8.1
chromosome ____ is the largest chromosome
1
the number of human genes is about ______ to ______
20,000: 22,000
a normal human male has
22 pairs of autosomes and one X and one Y chromosome
humans have ______ bases divided among ______ chromosomes
3 billion: 23 pairs of
an international project to sequence the entire human genome
Human Genome Project
most sex-linked genes are located on the ____ chromosome
X
female
XX
male
XY
what are sex-linked genes?
a gene located on a sex chromosome
linked genes
are on the same chromosome
chromosomes 1-22 are known as ______
autosome
chromosomes that contain genes for characteristics that are unrelated to sex
autosome
what are autosomes?
chromosome 1-22 in humans that contain genes for characteristics unrelated to sex
23 pairs in humans
chromosomes
humans have 23 pairs of _____
chromosomes
20,000 to 22,000 in humans
gene
differences in alleles account for the considerable _____ variation among people
genetic
the human _____ is all of the DNA of a human
genome
all of the DNA of the human species
human genome
linkage explains why certain characteristics are frequently _____ together
inherited
most of the human genome is made of
intergenic regions
shows the locations of genes on a chromosome
linkage map
genes on non-homologus chromosomes are not ____
linked
genes that are located on the same chromosome are _____ genes
linked
genes that are located on the same chromosome
linked genes
a linkage _____ shows the locations of a genes on a chromosome
map
the goal of the Human Genome Project was to
sequence all 3 billion base pairs of human DNA
the X and Y chromosomes are known as the _____ chromosomes
sex
determine the sex of a person
sex chromosomes
genes located on the sex chromosomes
sex-linked genes
what does a linkage map show?
shows the positions of genes on a chromosome based on the frequency of crossing-over between the genes
which of the following statements is correct?
the higher the frequency of crossing-over, the closer together on the same chromosome the genes are presumed to be
differences between the x and y chromosomes include...
the x chromosome has many more genes than the Y chromosome: virtually all of the X chromosome genes are unrelated to sex, whereas the Y chromosome contains genes that determine sex: both males and females have only one functioning copy of the X chromosome in each cell
what are sex chromosomes?
the x or y chromosome (in humans)
how is a carrier different from a person who has a genetic disease?
they do not have the disease but can pass it on to offspring
genes on the x-chromosome
x-linked gene
