Chapter 4: Modern GeneticsChapter 4: Modern GeneticsChapter 4: Modern GeneticsChapter 4: Modern Genetics
ReviewReview
An example of a trait that has
multiple alleles.
If a person has the combination of alleles O and B what would their blood type be?
Skin color and height are traits that show a
large number of different phenotypes
because they are controlled by
_________.
many genes
(polygenic inheritance)
The effects of genes are often changed by
an organism’s ____________.
The body cells contain _____ chromosomes.
The sex cells contain ___ chromosomes.
The two sex chromosomes
carried by a male are _____.
The two sex chromosomes carried by a female are ____.
Genes carried on the X or Y chromosomes are called _________.
An example of a condition that is sex-
linked is ______.
Hemophilia or
color-blindness
Sex-linked traits occur more often in ______, because
they carry only one X
chromosome.
A chart that tracks which members of a
family have a particular trait is called a ________.
In a pedigree chart a square is a symbol
for a _____.
A half-shaded circle on a
pedigree chart would indicate a
_________.
An abnormal condition that a person inherits
through genes or chromosomes is
a
__________.
A genetic disorder in which a
person’s blood clots very slowly
or not at all is called ______.
People with an extra copy of chromosome 21 have a disorder
called _________.
A person who has difficulty
distinguishing between the colors red and green has the sex-linked trait
called ________.
A picture of all the chromosomes in a
cell is called a _________.
Professionals who help couples
understand their chances of having a
child with a particular disorder are called
_________
genetic counselors
A procedure in which fluid from a developing baby is removed to test for genetic disorders is
called ________.
A genetic disorder in which the body
produces abnormally thick mucus is called
__________.
In _______, breeders cross two
genetically different individuals.
A _____ is an organism that is
genetically identical to the organism from which it was produced.
Inserting working copies of a gene directly into cells of a person with a genetic disorder is
referred to as _______.
The process of selecting a few organisms with
desired traits to serve as parents of the next generation is called
_________.
selective breeding
The transfer of genes from one
organism to another is called
________.
genetic engineering
The crossing of two individuals
that have identical or similar sets of alleles is called
_______.