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Bio Ch. 8-10 review
Terms in this set (22)
Which of the following is an example of a negative growth regulator?
transforming growth factor beta (TGF-β), which blocks the cell cycle when there is DNA damage
are signaling molecules that affect cell division
An example of an oncogene is a gene that codes for a protein that
pushes the cell cycle from the G1 phase to the S phase
Why is cancer more common in older people than in younger people?
Multiple genes must pick up harmful mutations for cancer to develop, and that takes time.
Which of the following is the last step in the development of a cancer
The majority of human cancers
arise from multiple somatic mutations accumulating in a single cell
Of the following scenarios, which is most likely to increase the odds that a cancer will develop?
One copy of an oncogene is hyperactive
The severe side effects of chemotherapy against cancer cells come about because
all rapidly dividing cells in the body are killed by the chemotherapy.
The illustration here shows the seven traits of garden peas that Gregor Mendel analyzed by conducting large numbers of crosses and recording the phenotypes of all their offspring over two generations. Which of the following statements is true?
When Mendel crossed homozygous tall plants and homozygous dwarf plants, the F2 progeny included one dwarf plant for every three tall plants.
Alternative versions of a gene for a given trait are called
If A and a are two alleles of the same gene, then individuals of genotype Aa are
Coat color in horses shows incomplete dominance, What is the predicted phenotypic ratio of chestnut to palomino to cremello if HCHCr individuals are crossed with other HCHCr individuals?
When the phenotypes controlled by two alleles are equally displayed in the heterozygote, two alleles are said to show
Traits that are determined by the action of more than one gene are
Which term indicates that the phenotypic effects of alleles for one gene can be suppressed by the alleles of another, independently inherited gene?
Sometimes a segment of DNA breaks off from a chromosome and then returns to the correct place on the original chromosome, but in reverse order. This type of chromosomal structural change is called
Which of the following can most precisely be described as a master switch that commits the sex of the developing embryo to "male"?
The SRY gene
Which of the following is an autosomal dominant disorder in which the symptoms begin late in life and the nervous system is destroyed, resulting in death?
Comparatively few human genetic disorders are caused by chromosomal abnormalities. One reason is that
most chromosomal abnormalities result in spontaneous abortion of the embryo.
Genes commonly exert their effect on a phenotype by
coding for a protein
crossing-over is more likely to occur between genes that are
far apart on a chromosome
Nonparental genotypes can be produced by
crossing over and independent assortment of chromosomes
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