5 Written Questions
5 Matching Questions
- homogametic sex
- polygene (quantitative trait locus)
- hemizygous gene
- pseudoautosomal regions 1 and 2
- a A gene present in only one copy in a diploid organism—for example, an X-linked gene in a male mammal.
- b A gene whose alleles are capable of interacting additively with alleles at other loci to affect a phenotype (trait) showing continuous distribution.
- c The sex with homologous sex chromosomes (e.g., XX).
- d Small regions at the ends of the X and Y sex chromosomes; they are homologous and undergo pairing and crossing over at meiosis.
- e Refers to an individual organism or cell having a genotype produced by recombination.
5 Multiple Choice Questions
- The transfer of electrophoretically separated fragments of DNA from a gel to an absorbent sheet such as paper; this sheet is then immersed in a solution containing a labeled probe that will bind to a fragment of interest.
- Nongenetic chemical changes in histones or DNA that alter gene function without altering the DNA sequence.
- A chain of linked nucleotides (having deoxyribose as their sugars). Two such chains in double helical form are the fundamental substance of which genes are composed.
- More or less synonymous with phenotype.
- The classical approach to genetic analysis, in which genes are first identified by mutant alleles and mutant phenotypes and later cloned and subjected to molecular analysis.
5 True/False Questions
recombination → Recombination from assortment or crossing over at meiosis.
transcription → The synthesis of RNA from a DNA template.
molecular marker → The two copies of a particular type of gene present in a diploid cell (one in each chromosome set).
null allele → One of the different forms of a gene that can exist at a single locus.
nucleosome → The basic unit of eukaryotic chromosome structure; a ball of eight histone molecules that is wrapped by two coils of DNA.