A person's unique DNA is carried within some of the cells and tissues of their body. These include all of the following EXCEPT:
A. intestines
B. blood.
C. skin cells.
D. saliva.
E. All of the above contain a person's DNA.
Ans: E. All of the above contain a person's DNA.
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Achondroplasia, a hereditary form of dwarfism, is an autosomal dominant disorder; however homozygous dominant
individuals either die before birth or very shortly thereafter. The homozygous recessive condition is normal. A dwarf couple decide to have children. Use this information to answer the following question:Of the children of this couple who survive, what is the probability that they will be normal?
a. 0 b. ¼ c. 1/3 d. 2/3 e. ½
Genes at one locus that affect the expression of genes
at a different locus are said to be a. epistatic. b. linked. c. codominant. d. penetrant. e. alleles.
An evolutionary model of animal development explains how _____.
A. animal body plans are constrained by existing structures in ancestral organisms. B. homeotic genes are not universal among animals. C. homeotic genes are found only in fruit flies, where they are responsible for odd placement of appendages. D. new genetic lines are produced less by modification than by unique mutation. E. somites form as blocks of genes in cells randomly distributed throughout the body.
Both meiosis I and meiosis II decrease the total number of chromosomes found in a cell.
a. true b. false