Genetic Probabilities
Genetic Probabilities
DNA,Chromosomes,Genes
DNA, Chromosomes, Genes
100
Consider the possible genotypes of the offspring of two heterozygous brown goats. The ratio of brown to white offspring in this case would be
A)1:3.
B)2:2
C)3:1.
D)3:4
C)3:1.
100
12) In pea plants, wrinkled seeds (W) is the dominant trait, while smooth seeds (w) is the recessive trait. Consider the cross Ww X WW.
What will be the ratio of wrinkled to smooth seeds?
A)0:4 wrinkled:smooth
B)2:2 wrinkled:smooth
C)3:1 wrinkled:smooth
D)4:0 wrinkled:smooth
D)4:0 wrinkled:smooth
100
The nucleus contains the cells genetic material in the form of
A)
ADP.
B)
ATP.
C)
DNA.
D)
RNA.
C)
DNA.
100
A portion of this DNA, known as a ________, is responsible for the inheritance of a trait, like eye color or blood type in humans.
A)chromosome
B)codon
C)gene
D)nucleotide
C)gene
200
Huntington's disease causes a slow degeneration of the nervous system, beginning at about age fifty. Patients with Huntington's disease lose control of their limbs and become forgetful. As the disease grows more severe, it paralyzes and kills them. The disorder is dominant.Suppose that Bill's genotype is (Hh) and his wife Sharon is (hh).
What are the chances that his daughter, Grace, will also have Huntington's?
A)0%
B)25%
C)50%
D)100%
C)
50%
200
In horses, black (B) is the dominant color; brown (b) is the recessive color. Consider the cross seen here, between two black horses (Bb). What is the probability that these two horses will have a foal that is brown?
A)0%
B)25%
C)40%
D)50%
B)25%
200
What does this diagram represent?
A)
DNA
B)
RNA
C)
a gene
D)
an allele
A)
DNA
200
The color of your eyes is an example of an inherited trait. These are the traits that are passed down to you from your parents.
How are inherited traits like this passed from parents to their children?
A)Traits like this are developed over a long period of time.
B)Traits like this are responsible for the way you look, act, and feel.
C)Traits like this are determined by the genes passed from parents to their children.
D)Traits like this are determined by the knowledge passed from parents to their children.
C)Traits like this are determined by the genes passed from parents to their children.
300
Among a species of butterflies, the color blue (B) is a dominant trait. Yellow color (b) is a recessive trait. If a pure blue butterfly (BB) mates with a pure yellow (bb), what will the offspring look like?
A)They will all be blue.
B)They will all be yellow.
C)Half will be blue and half will be yellow.
D)About 75% will be blue and 25% will be yellow.
A)They will all be blue.
300
Brown rabbits have the genotype BB or Bb. White rabbits have the genotype bb. If two brown rabbits, with the genotypes seen in the Punnett square above, have baby rabbits, what is the probability that the baby rabbits will also be brown?
A)25%
B)50%
C)75%
D)100%
C)75%
300
Chromosomes, which contain DNA, have several functions. All BUT ONE of these statements is a function of chromosomes.
A)Chromosomes determine the traits of an organism.
B)Chromosomes provide instructions to make proteins.
C)Chromosomes determine the gender of an individual.
D)Chromosomes help an organism produce usable energy.
D)Chromosomes help an organism produce usable energy.
300
Our traits are determined by our genes and these traits are inherited. Where do our genes come from?
A)our father
B)our mother
C)from both parents equally
D)part from our mother but mostly from our father
C)from both parents equally
400
Suppose a mother carries two recessive genes for freckles (rr) and a father carries one recessive gene for freckles and one dominant gene for clear facial skin (Rr). What is the likelihood that their first child will have freckles?
A)1/2
B)1/4
C)3/4
D)4/4
A)1/2
400
This black dog mates and has puppies with a solid white dog. The white dog has the genotype bb. The match produces a litter of 8 puppies: 6 black and 2 white. What is the most likely genotype of this black dog?
A)B
B)BB
C)Bb
D)bb
C)Bb
400
A trait is a feature or quality of an organism. All organisms have a unique set of traits that they inherit from their parents. Each parent supplies one half of the __________ needed to determine the traits of their offspring.
A)centromeres
B)chromosomes
C)karyotypes
D)nuclei
B)chromosomes
400
Information about traits is stored in the cell nucleus in a molecule called ______.
A)DNA
B)ATP
C)cytoplasm
D)the nucleus
A)DNA
500
11) In rabbits, B represents the allele for black coat and b represents the allele for white coat. Black is dominant over white. If a rabbit has the genotype Bb, what is the rabbit's phenotype?
A)gray
B)black
C)white
D)BB X bb
B)black
500
Freckles are a dominant trait in humans. Both of the girls have the genotype FF for freckles. If either one marries a man with no freckles, what are the chances that their children will have freckles?
A)0%
B)50%
C)75%
D)100%
D)100%
500
Inherited traits are passed down from our parents to us, their offspring, by the information that is coded in our parents'
A)RNA.
B)antibodies.
C)chromosomes.
D)plasma.
C)chromosomes.
500
Brown eyes in humans is a dominant trait. We inherit dominant traits from our parents, some from our mother and some from our father, in the form of
A)RNA.
B)gametes.
C)genes.
D)traits.
C)genes.