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Human Genetics SG

Human Genetics Study Guide

QuestionAnswer
How many chromosomes are shown in a normal human karyotype? 46
Which of the following are shown in a karyotype? homologous chromosomes,sex chromosomes,autosomes,all of the above all of the above
In humans, a male has one X chromosome and one Y chromosome
Human females produce egg cells that have one X chromosome
what is the approximate probability that a human offspring will be female? 50%
what percentage of human sperm cells carry an X chromosome? 50%
In a pedigree, a circle represents a(an) female
Which of the following is caused by a dominant allele that expresses itself late in a persons life? Huntington disease
If a man with blood type A and a woman with blood type B produce an offspring, what might be the offspring blood type? A,B,AB, or O
Sickle cell disease is caused by a? Change in one DNA base
In cystic fibrosis, a change in a single gene causes the protein called CFTR to fold improperly
Compared with normal hemoglobin, the hemoglobin of a person with sickle cell disease has a different sequence of amino acids
people who are heterozygous for sickle cell disease are generally healthy because they usually have some normal hemoglobin in their red blood cells
the sequencing of human chromosomes 21 and 22 showed that some regions of chromosomes do not code for proteins
alleles found on the same chromosomes are linked
most sex-linked genes are located on the X chromosome only
colorblindness is more common in males than in females because the allele for colorblindness is recessive and located on the X chromosome
true or false?- a colorblind boy received the allele for colorblindness from his mother true
the formation of a Barr body causes the genes on one of the X chromosomes in a female cell to be switched off
a cat that has spots of more than one color is probably female
the failure of chromosomes to separate during meiosis is called nondisjunction
because the X chromosome contains genes that are vital for normal development, no baby has been born without an X chromosome
which of the following combinations of sex chromosomes represents a female XX
If nondisjunction occurs during meiosis, some gametes may form instead of four
Nondisjunction can involve-autosomes,sex chromosomes,homologous chromosomes,all of the above all of the above
scientists test for alleles that cause human genetic disorders by detecting the DNA sequences found the those alleles
the process of DNA fingerprinting is based on the fact that no two people, except identical twins, have exactly the same DNA
the human genome project is an attempt to sequence all human DNA
the human genome was sequenced by using computers to find overlapping regions between sequenced DNA fragments
what cannot be obtained from the humans genome project? whether an allele is dominant or recessive
the purpose of gene therapy is to cure genetic disorders
which of the following is the first step in gene therapy? identifying the faulty gene that causes the disease
A__________ can be used to determine whether a person has inherited the normal number of chromosomes karyotype
In humans, sex is determined by the X and the____chromosomes Y
A __________ is a diagram that follows the inheritance of a single gene through several generations of a family. pedigree
people who have sickle cell disease inherited_____copies of the sickle cell allele. 2
a boy who has hemophilia inherited the disorder from his________ mother
A female with the disorder_______inherits only one X chromosome and has the genotype XO turners syndrom
Nondisjunction in males can lead to the disorder called_________ kleinefellter's Syndrom
why are all X-linked alleles expressed in males, even if they are recessive? males have just one X chromosome
Explain why the father of a girl who is colorblind must also be colorblind the girl has to inherit it from the X chromosome from both mom and dad
Created by: veg4fuel
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