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Bio chap 14
Terms in this set (34)
Phenylketonuria is caused by an autosomal recessive allele. A man is the carrier of the disorder; his wife does not have PKU and is not a carrier. What is the probability their offspring will have the disorder and other will be carriers?
0% of the offspring will have the disorder; 50% will be carriers
Human females produce egg cells that have
one X chromosome
Which of the following is true about karyotype analysis?
It is now an important medical tool used in predicting the likelihood that an unborn child will be normal.
Which of the following pairs of genotypes result in the same phenotype
IBIB and IBi
Which of the following statements is true of sex chromosome abnormalities in humans?
They usually have mild effects and rarely are fatal.
In a pedigree chart, a circle represents
If a disease is caused by a dominant allele, it means that a person with the disease:
only needs to have one copy of the allele that causes the disease in order to have symptoms of the disease
Sex-linked genes are located on
both the X chromosome and the Y chromosome
A human female inherits
two copies of every gene located on the X chromosome
What percentage of human sperm cells carry an X chromosome?
A mutation involving a change in a single DNA base pair
may have an effect on an organism's phenotype.
Male sex chromosome abnormalities can be due to abnormal numbers of ______________ chromosome
either the X or the Y
Which of the following diseases and conditions does not appear until late in a person's life?
Which of the following statements is true?
A colorblind girl's father must be colorblind.
A patient (age 41) presents with jerky, random, and uncontrollable movements or chorea, Psychomotor functions have become increasingly impaired over the past few years, such that any action that requires muscle control is affected. Common consequences are physical instability, abnormal facial expression, and difficulties chewing, swallowing and speaking. The Patient has one parent who died at 44 after exhibiting similar symptoms. This patient may be exhibiting symptoms of
Cutting DNA into small pieces that can be sequenced is accomplished by
Having a larger number of genes means an organism
may or may not be more complex.
What is the approximate probability that a human offspring will be female?
Why are males more likely to exhibit an X linked recessive trait than females?
Most genes on the X chromosome are not shared with the Y.
Sickle cell disease is caused by a
change in one allele
In cystic fibrosis, a change in a single gene causes the protein called CFTR to
Which of these statements would indicate that a trait has a genetic component?
Your brother, cousin and great uncle have all been diagnosed with muscular dystrophy, a disorder that affects 1/7000 people.
A karyotype reveals that a woman is carrying a fetus that has 47 chromosomes. The test reveals that the genotype of the fetus is XYY. Which of the following statements would be correct?
this is a trisomy; most likely the sperm cell had a nondisjunction
If a man with blood type A and a woman with blood type B produce an offspring, what might be the offspring's blood type?
A, B, AB, or O
A cat that has spots of more than one color
is probably female
The patient most likely has
Colorblindness is more common in males than in females because the allele for colorblindness is
is recessive to their sons only
A couple comes to your genetic counseling clinic concerned that they might have a second child affected with the same X-linked recessive disease displayed by their son. Neither of the parents displays the trait. What do you tell them?
They have a ¼ chance of having another affected child but only if the child is a boy. They could try to select "girl" sperm to avoid the disease.
Which of the following would be most likely to be inherited in an autosomal recessive pattern in humans?
A point mutation in a regulatory element reduces the level of gene expression of a gene on chromosome 12.
Which of the following form(s) a Barr body?
One of the X chromosomes in the female cell.
The main goal of the human genome project was to
accurate sequence of the 3 billion DNA base pairs that make up the human genome and to find all of the estimated 20,000 to 25,000 human genes. The Project also aimed to sequence the genomes of several other organisms that are important to medical research, such as the mouse and the fruit fly.kjl
Alteration of gene sequences in individuals affected by genetic disease:
Can be demonstrated by gene cloning and DNA sequencing.
If you sequence short pieces of DNA and then use a computer to find overlapping sequences that map to a much longer DNA fragment you are using
Name the mode of inheritance for Cystic Fibrosis
defect in the cystic fibrosis transmembrane regulator (CFTR) gene.
Since CF is a recessive trait, a child must receive two defective genes in order to be born with the disease. As with all chromosome pairs, one is inherited from the mother and one is inherited from the father
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