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47 terms

Chapter 9 Biology-JEH

Genetics
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In order to determine the phenotype of an individual who expresses a dominnat trait, you would cross that individual with who?
A person who is Homozygous recess for that trait
All the offspring of a cross between a red flowered plant and a white flowered plant have pink flowers. What does this mean?
The allele for the red flowers is incompletely dominant tot he allele for white flowers.
Locus
The name given to a the specific location of a gene on a chromosome
Hypophosphatemia (vitamin D- resistant rickets) is inherited as an x-linked dominant. What would be the outcome of a cross between a homozygous recessive woman and a man with hypophoshatemia?
all the daughters and none of their sons exhibit hypophosphatemia
An individual with (naturally curly hair and an individual with (naturally) straight hair mate, all of their offspring have (naturally) wavy hair
incomplete dominance
The recombination frequency between gene B and Gene C is 11% the recombination frequency between gene B and gene D is 5%. The recombination frequency between gene C and gene D is 15%. The arrangement of these genes on a linkage map is DBC
...
What is the key to the recognition of codominance?
Heterozygote expresses the phenotype of both homozygotes
Red-green color blindness is inherited as an X-linked recessive A man with normal color vision father
A man with normal color vision cannot father a daughter who is red-green color blind
AA x aa will produce what offspring?
Heterozygous
What is the probability that a daughter will inherit an X-linked recessive trait from her father?
100%
Attached earlobes are recessive to free earlobes. The phenotypic of an individual with attached earlobes mates with an individual heterozygous for free earlobes is what?
1:1- a test cross
A BbCc x bbcc cross produces offspring in a 5:5:1:1 because why?
because of linked genes
In humans the inheritance of weight would be what?
polygenetic
the key to recognition of incomplete dominance is the phenotype of the heterzygote falls between
the phenotypes of the homozygotes
a true breeding plant that produces yellow seeds is crossed with a true breeding plant that produces freen seeds to produces F1 plants that have Yellow seeds
the expected phenotypic ratio of seed color of the offspring of an F1 xF1 cross is 3:1
According to Mendels principle of segregation
Gametes have one copy of each allele
Attached earlobes are recessive to free earlobes. The gentypic ratio is expected to be 1:1 when an individual with attached earlobes mates with
an individual heterozygous for free earlobes
the phenotype of an individual whi is heterozygous for dimples would be what?
Dd
The wild type is the trait most commonly found where?
nature
ASll the offspring of a cross between a plack eyed MendAlien and an orange eyed MendAlien have black eyes. This means that the allele for the black eyes is
dominant to the allele for orange eyes
A couple who has two female children. The probability that their next child will be male is what?
50%
A individual with (naturally) curly hair and an individual with (naturally) straight hair mate ; all their offspring have (naturally) wavy hair. If an individual with wavy hair mates with an individual with Straight hair what is the probability that their child will have curly hair?
0%
A dihybrid cross produces 30 recombinant offspring out of a total of 1,000 offspring. What is the recombinant frequency of the two gene pairs?
3%
Marfan's syndrome is the result of what ?
inheriting a sinfle allele
individuals with Marfan's syndrome have what physical and mental characteristics and defects?
tall and long limbed and have both cardiovascular and eye defects
The inheritance of Marfan's syndrome is a example of what?
pleiotropy
To be a carrier for Cystic Fibrosis you have to be what?
Heterozygous
Aminocentosis is usually done between what weeks in pregnancy?
14-20
The key to the recognition of a trait whose expression is determined by the effects of two or more genes (polygenic inheritance) is what ?
the trait exhibits a continuous distribution
Alleles are alternative forms of what?
genes
The expected Pehntypic ratio of the following cross; AaBb x AaBb
9:3:3:1
The mating between a pedigreed chihhuahua and a great dane would produce what?
a hybrid
You conduct a dihybrid cross and then test cross the F1 generation. What ration would make you suspect they are related?
7:7:1:1
An individual with the blood group genotype LMLN had a phenotype of MN. What is the relationship?
There is codominance
Attached earlobes are recessive to free earlobes. What is the probability of have a child with attached earlobes when an individual with attached earless mates with an individual heterozygous for free earlobes?
50%
A true breeding palnt that produces yellow seeds is crossed with a true breeding plant that produces green seeds. All the seeds of all the offspring are yellow because why?
The yellow allele is dominant to the green allele
Nonsex chromosomes are called what?
autosomes
True breeding plants self fertilize to produce offspring identical to what?
the parent
Round seeds are dominate to Yellow seeds and yellow seeds are dominant to green seeds What is the phenotypic ratio of a cross between an RrYy and an rryy individual is what?
1:1:1:1
Linked genes violate Mendel's principle of what?
independent assortment
Assume that having three nostrils is inherited as a y-linked trait. A man with three nostrils has a daughter who has a son with a man who has only two nostrils the probability that he has a three nosstriled grandson is ?
0%
An individual with the blood group genotype LmLn has the phenotype mn, The expected phenotypic ratio of a cross between a person with phenotype N and a person with phenotype mn is what?
1mn:1n
The basis for Mendel'l principle is
the behavior of chromosomes during anaphase I and Ananphase II
A color blind woman mates with a man who is not color blind all the sons and none of the daughters are color blind.
the gene for the color vision is linked to the x chromosome
An individual with the genotype AaBb produces four different gametes in equal proportions. This is a demonstration of What?
Mendels principle of independent assortment
In humans, free earlobes (E) are dominant to attached earlobes (e) and the presence of freckles (F) is dominant to the absence of freckles (f) if an individual heterozygous for both of these traits were to mate with an individual with attached earlobes and no freckles, what are the chance of having a child with attached earlobes and freckles?
25%
An individual who is homozygous
carries two copies of the same allele for an gene