A sporophyte is a ____ plant body that grows
by ____ from a ____.
a. haploid; mitosis; spore
b. diploid; mitosis; spore
c. diploid; mitosis; fertilized egg
d. diploid; meiosis; fertilized egg
e. haploid; mitosis; fertilized egg
C
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Which of the following statements about single nucleotide polymorphisms (SNPs) is correct? (Choose all that apply)
A. For some disorders, multiple SNPs plus environmental factors are necessary in order for the disorder to present itself. B. Genotyping SNPs instead of sequencing entire genomes allows researchers to find correlations between genetic risk factors and disease. C. SNPs are useful in the diagnosis of a disease but not in the prediction of an individual's risk for acquiring that disease. D. Individuals who are heterozygous for the S allele in the ?-globin gene are more likely to develop sickle-cell anemia than individuals who are homozygous for the S allele in the ?- globin gene. E. The presence of an SNP in an organism's genome when compared to the "standard" genome of that organism means that a disease condition will develop.
The sporangia (asci) of ascomycetes each ultimately produces:
A. eight diploid spores B. four genetically identical haploid spores C. four haploid spores, each genetically different D. eight identical haploid spores E. eight haploid spores, of which there are two each of four different genetic types
The tube feet of a sea star
a. bear tiny toes. b. are located only at the tips of the arms. c. function in movement. d. protect the organism from predatory fish.
Deletion of an entire autosome ____
a. causes XYY syndrome b. causes Down syndrome c. causes no physical symptoms d. is lethal e. is called polyploidy