How can we help?

You can also find more resources in our Help Center.

38 terms

bob jones life science 8 chapter 7 and 8 review

STUDY
PLAY
Genetics
study of inheritance.
purebred organism
one in which the traits have remained the same for many generations.
mating specific organisms to test how traits are inherited is the act of a:
cross.
hybrid
when the ancestors are not alike .
give an example of a hybrids ancestors
a pea plant parent was tall, and another pea plant parent was short.
dominant
has more influence on a trait than a recessive factor does,refers to the characteristic that is expressed,even when a recessive gene is present.
recessive
refers to the characteristic that is masked when a dominant gene is expressed.
phenotype
the way a plant or organism looks-its physical characteristics.
genotype
the specific factors an organism possesses .
zygotes
the cell formed when two reproductive cells,(such as egg and pollen) unite.
punnett squares,
what many people use to visualize the way mendels theories work.
gametes
special reproductive cells designed to transfer or receive the chromosomes.
incomplete dominance
when two traits combine or blend together to produce a different trait.
codominance
a pattern where both the dominant and recessive traits are expressed.
multiple gene inheritance
when two or more genes are responsible for producing a single trait.
X chromosome
in a female there are two of these sex chromosomes.
Y chromosome
smaller than the X chromosome and has very few genes. only expressed in males.
sex-linked traits
inherited trait that has a gene on the X chromosome but no corresponding gene on the Y chromosome.
carriers
people who have the gene for a trait but do not express the trait for themselves.
inherited disorders
abnormal traits that are passed on through genes.
mutation
any change in an organisms genetic material.
lethal mutations
causes the organism to die before it is born.
gene mutation
occurs when there are changes in the sequence of bases on the segment of DNA that makes up a gene.
somatic mutation
Are not passed on to future generations.
germ mutations
may not affect the organism in which it occurs, but it can affect the organisms offspring.
chromosomal change
a change involving the number of chromosomes or the number or location of genes on a chromosome.
hemophelia
known as "bleeders" disease, or the "disease of royalty"
Duchenne muscular dystrophy
causes the muscles to enlarge and swell and then shrink and waste away.
cystic fibrosis
affects both the mucous and sweat glands of the body. and instead of producing normal,free-flowing mucus,a child with cystic fibrosis produces thick,sticky mucus that plugs the glands.
tay sachs
children with this disease lack a special enzyme that breaks down fatty substances.
malignant hyperthermia
caused by the dominant gene.
achondroplasia
causes the leg bones in the arms and legs to stop growing before they should.
selective breeding
choosing certain organisms with desirable traits to breed in the hope that their offspring also will have desired traits.
inbreeding
the mating of an organism with its close relatives.
crossbredding
involves breeding individuals from different varieties to produce offspring that have the traits of both parents.
breed
a group of organisms that is purebred for certain characteristics.
genetic engineering
using special techniques to control the genetic makeup of an organism.
human genome project
to create a map of the human genome.