Achondroplasia is a form of dwarfism caused by a dominant allele. The homozygous dominant genotype causes death, so individuals who have this condition are all heterozygotes. If a person with achondroplasia mates with a person who does not have achondroplasia, what percentage of their children would be expected to have achondroplasia?
A. 75%
B. 0%
C. 50%
D. 100%
C. 50%
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Diffusion of morphogens—products of master
genes—creates gradients that cause the differential expression of other genes such as __________, which govern the formation of specific body parts. Fill in the blank(s) with the appropriate word(s).
A peptidoglycan-hydrolyzing protein isolated from bacteriophage P68 has been used in synergy with the antimicrobial agent gentamicin, enhancing the antimicrobial effects of the drug toward Staphylococcus aureus. This is an example of microbial control by ________.
A. antisepsis B. predation C. enzybiotics D. sterilization E. heavy metals
What is thought to be the correct sequence of these events, from earliest to most recent, in the evolution of life on Earth?
1. origin of mitochondria 2. origin of multicellular eukaryotes 3. origin of chloroplasts 4. origin of cyanobacteria 5. origin of fungal-plant symbioses A) 4, 3, 2, 1, 5 B) 4, 1, 2, 3, 5 C) 4, 1, 3, 2, 5 D) 4, 3, 1, 5, 2
Which of the following organelles isnot part of the endomembrane system?
(a) Golgi apparatus (b) the nucleus (c) mitochondria (d) lysosomes