A man with albinism and a woman with a normal phenotype have several children, one of whom displays albinism. a. What can you conclude about the genotype of the mother? b
What is the probability that the children who do not display albinism are heterozygous?
(a) The mother must be heterozygous (a carrier) in order to have even one offspring with albinism.
(b) With parents of genotype Aa × aa, any offspring that do not display albinism in their phenotype must be heterozygous, so the probability is 100%.
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In eukaryotes, precursor mRNA molecules are processed in the
A) ribosomes. B) nucleus. C) mitochondria. D) cytoplasm. E) nucleolus.
An area of a polypeptide that bends in a particular way, relatively independent of the rest of the molecule, is a folding:
A) segment B) domain C) lariat D) exon E) region
RNA polymerase moves in which direction along the DNA?
A. 5' to 3' along the double-stranded DNA B. 3' to 5' along the nontemplate strand C. 5' to 3' along the template strand D. 5' to 3' along whichever strand it's on E. 3' to 5' along the template strand
The pufferfish, Fugu rubripes, has a genome that is one-tenth the size of mammalian genomes. Which of the following statements is not a possible reason for this size difference?
(a) Intron sequences in Fugu are shorter than those in mammals. (b) Fugu lacks the repetitive DNA found in mammals. (c) The Fugu genome seems to have lost sequences faster than it has gained sequences over evolutionary time. (d) Fugu has lost many genes that are part of gene families.