Card Set Information
Study cards for Chapter 15 "Chromosomal Inheritance" BIOL 189 CSN
Something that can be passed on from generation to generation is a/an ____________ factor.
Which was mapped first mitosis or meiosis?
When was mitosis mapped?
When was meiosis mapped?
The realization that genes at specific locations, called loci, played a role in the transmission of inheritable factors led to the:
Chromosomal Theory of Inheritance
Initial work on chromosomal mapping was done with:
How many pairs of chromosomes do drosophilia flies have?
What do we call the recessive phenotype of drosophilia flies?
Are "wild type" drosophilia flies dominant or recessive?
X-linked alleles are traits that are carried on the:
If an X-linked trait is recessive, will it be expressed more often in males or females?
Why are males more likely to express a recessive X-linked allele?
they only have one X chromosome
True or False: If a women is homozygous recessive for an X-linked trait, all of her sons will express the recessive allele.
Which chromosome is larger, X or Y?
If a male has a recessive allele for trait Q, what two gametes can he produce?
How many autosomal chromosomes does a female human have?
How many chromosomes does a sperm have?
What two sex chromosomes could a sperm have?
X or Y
How many possible sex chromosomes could a human egg have?
Homo Sapien diseases that are the result of genetic information on sex chromosomes are known as:
human X-linked disorders
An X-linked disorder that causes progressive weakening of the muscles is:
Duchenne musclular dystrophy
True or False: Humans with Duchenne muscular dystrophy live to average life expectancy.
False - they will die in late teens/early twenties due to progressive organ failure
Hemophilia is a disease characterized by an:
inability to clot blood
What are the three types of cones that are responsible for color vision?
Which of the three types of cones in your eyes are coded for on autosomal chromosomes?
When we say a person is color-blind, we mean that they are specifically:
List the three human X-linked disorders discussed in class.
Duchenne muscular dystrophy
Why was hemophilia so prevalent in the British royal family in the past?
because they were inbred
True or False: During embryonic development, one of a females X chromosomes becomes inactive.
The inactive X chromosome in a female cell condenses and becomes a:
If a female is heterozygous for an X-linked trait, half of her cells will express the dominant, while half express the recessive. This is due to:
True or False: In regards to X inactivation, the dominant allele still overrides the recessive.
What is a linkage group?
a group of genes, physically located close to each other on a chromosome, that are transmitted together
What is the purpose of a linkage map?
to map out the location of genes on a chromosome to determine which alleles are transmitted together
What is a polyploid?
an individual with more the 2n chromosomes
An individual with 3n chromosomes is called a:
An tetraploid is an individual with ____ chromosomes.
Which are more likely to exhibit polyploidy, plants or animals?
True or False: Polyploidy results entirely from genetic manipulation.
False - polyploidy is mostly an evolutionary adaptation, although some genetic manipulation has occured
An individual that exhibits monosomy is missing ____ of a certain chromosome.
A person with (2n-1) chromosomes has a condition known as:
An individual with (2n+1) has condition known as:
A person with trisomy has ____ of a particular chromosome.
Three of chromosome #21 results in a condition known as:
Monosomy and trisomy occur due to:
When can nondisjunction occur?
Improper chromosomal separation during meiosis is known as:
If nondisjunction occurs during meiosis I, all resulting gametes will be:
If nondisjunction occurs during meiosis II, what percentage of gametes could still be normal?
1/2 or 50%
List the six genetic mutations discussed in class.
When a piece of DNA gets "clipped out," you have what kind of mutation?
When one area of a chromosome can be found twice, you have what kind of mutation?
When two areas of a chromosome have "flip-flopped," you have what kind of mutation?
When a piece of genetic material has been transferred from one chromosome to another, you have this type of mutation.
When a random piece of DNA is spliced into a chromosome, you have this type of mutation.
When one piece of a chromosome is replaced with another, you get this type of mutation.