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multiple choice questions:
1- What fraction of the progeny will show a recessive phenotype for just one gene in a cross
between AaBbCc x AaBbCc?
2- Siblings share what percentage of their alleles?
3- In a heterozygote, one allele conceals the presence of another. This is Mendel's:
A. principle of segregation.
B. principle of independent assortment.
C. principle of dominance.
D. principle of dihybrid crosses.
E. principle of monohybrid crosses.
4- A dihybrid cross is:
A. crossing individuals of two different species together.
B. selfing an individual.
C. crossing two individuals with two different alleles for the same trait.
D. crossing two individuals that differ in two different traits.
E. crossing two individuals with two different alleles in the same two traits.
5- How many different kinds of gametes can a DdGgww individual form?
6- A cross between two heterozygotes for one trait yields a phenotypic ratio of 2:1. What is the best explanation?
A. The dominant trait is lethal in its homozygous form.
B. The trait forms sterile progeny.
C. Either the dominant or the recessive allele in its homozygous form is lethal.
D. The trait causes semisterility in one of the parents.
E. The recessive allele for the trait is lethal in its homozygous form.
F. A and D.
7- Below is a list of possible environmental effects on the expression of genes. Which are valid?
A. A small temperature change effects viability.
C. cystic fibrosis
D. A and B
E. A, B, and C
8- Two white flowers were cross fertilized. The resulting F1 only contained purple flowers. What is a plausible explanation?
A. The gene coding for white mutated.
B. There is an epistatic interaction.
C. The parental varieties had complementary genotypes allowing purple to be expressed.
D. Four different genes were involved.
E. B and C.
F. B and D.
9- Which of the following can effect the expression of a phenotype?
C. incomplete penetrance
D. variable expressivity
E. all of the above
10- Humans with the disorder PKU develop light colored hair. What kind of genetic effect is this?
D. variable expressivity
E. incomplete penetrance
11- The ability to produce the M and N antigens is determined by a gene with two alleles. Heterozygotes for the trait produce both kinds of antigens. What is this an example of?
A. incomplete dominance
B. partial dominance
E. A and B
12- A man has inherited an allele that codes for blue hair, but his hair is brown. This is a possible example of:
A. variable expressivity.
B. incomplete penetrance.
C. an environmental interaction.
D. an epistatic interaction.
E. all of the above
13- Which of the following is not a feature of continuous traits?
A. environment influences phenotype
B. Effect of environment can vary with genotype.
C. Mendel's laws do not apply to these traits.
D. Two or more genes are often involved.
E. all of the above
14- Determining the number of genes controlling a continuous trait can be difficult because:
A. Environmental effect may vary with genotype.
B. Linked genes may act as if they are a single unit.
C. Physiological basis is impossible to determine.
D. Some loci may contribute more to phenotype than others.
E. Such traits are hard to measure.
F. A, B, C
G. B, C, D
H. A, B, D
15- Knowledge of heritability is important for:
A. developing conservation strategies for natural populations.
B. developing goal oriented selective breeding programs.
C. developing health care programs (for high blood pressure, etc.).
D. understanding how natural populations evolve.
E. all of the above
multiple choice questions: 1- What fraction of the progeny will show a recessive phenotype for just...
Multiple choice: 1) Which of the following can effect the expression of a phenotype? A. environment B. epistasis C. incomplete penetrance D. variable expressivity E. all of the above 2) Humans with the disorder PKU develop light colored hair. What kind of genetic effect is this? A. epistatic B. pleiotropic C. phenotypic D. variable expressivity E. incomplete penetrance 3)The ability to produce the M and N antigens is determined by a gene with two alleles. Heterozygotes for the trait...
1) Select the true statements about dominant and recessive genes, assuming complete penetrance of the genotype. Circle all that apply. (1.5) For an offspring to be phenotypically dominant for a trait, at least one parent will show the trait. For an offspring to be phenotypically recessive for a trait, at least one parent will show the trait. In incomplete dominant or codominant traits, heterozygotes will have a different phenotype than either homozygote. If both parents show a recessive trait, then...
Mendel worked with pea plants that showed complete dominance for several traits. He was able to check his hypotheses about how inheritance works. He determined that traits are caused by two (? ) factors - one from the mother and one from the father. ?= form of allele that will mask the recessive ?= form of allele that will not show unless both alleles are recessive. ?= sections of a chromosome that code for proteins (and show up as traits)....
exercise 6 pre lab mendallion and human gametes QUESTION 1 Select the term described An allele expressed only in the absence of a dominant allele Term for genes that behave predictably In F2 generations One variety of a gene there may be many varletions in a population Using pollen from a different plant to another plant A genetic map of traits overal gener offspring of two parents with different trait Using pollen (sperm from the same plan own egg The...
Circle the correct answer, there may be more than one correct answer 1. Diploid Organisms: a) typically have 23 pairs of chromosomes b) are heterozygous for a trait when they carry different alleles c) carry 2 copies of chromosomes d) are homozygous for a trait when they carry different alleles 2. Why are garden peas a good subject for Mendel's experiments? a) garden peas had either or traits b) garden pess could self-pollinate to produce offspring of the same variety...
1. Describe two kinds of recombination in eukaryotes. True of False 2._____ A recessive phenotype can be expressed by some progeny of a monohybrid cross. 3._____ Epistatic genes may result from dominant or recessive alleles. 4._____ At a single locus, a diploid individual may have more than two different alleles. 5. _____ A temperature-sensitive allele is an example of a genotype x environment interaction. 6. _____ All of the genetic material in a eukaryotic cell is found in the nucleus....
Bio215 Problem Questions Hassanaton MULTIPLE CHOICE 1) Pea plants were particularly well suited for use in Mendel's breeding experiments for all of the following reasons exep that ) peas show easily observed variations in a number of characters, such as pea shape and flower color. B) it is possible to completely control matings between different per plants. C) it is possible to obtain large numbers of progeny from any given cross. D) peas have an unusually long generation time. E)...
What is the probability that for a particular trait, two heterozygous parents will both contribute a recessive allele to their child? For a typical Mendelian trait with complete dominance how many different phenotypes are possible? For alleles that display incomplete dominance, how many phenotypes are possible? Some phenotypes appear to be expressed on a continuum. Several traits in this lab demonstrate this. If most genes have only two alleles, how can some phenotypes be so variable? Chin shape genes are...
1) What is the molecular basis of dominant and recessive alleles (for complete dominance; ignore incomplete dominance, epistasis, etc.)? To answer this question, consider the following: a) If alleles are copies of the same gene, why are two types of alleles? What differentiates a dominant allele from a recessive allele (at the molecular level)? Be specific (base pairs, transcription/translation method, protein produced, etc.) b) Why is the phenotype determined by the dominant allele in heterozygous genotype? Be specific. c) What...
match the mendelian genetics definition with the best term a gene that affects more than one phenotype the combination of two alleles which comprise the gene pair the allele that expresses itself at the expense of an alternate allele the form that is shown": it is the outward, physical appearance of a particular trait one alternative form of a given allelic pair the offspring of two parents that are homozygous for alternate alleles of a gene pair an individual heterozygous...