Females have two copies of the X chromosome, so they can be homozygous or heterozygous for any genes found on the X chromosome. Males have only one copy of the X chromosome. What term is used to describe this inheritance state?
What will be an ideal response?
hemizygous
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Look carefully at the image of the human karyotype shown in Figure 11.3. What is the significance of the small differences between homologous chromosomes?
A. Each homologous chromosome in a pair is from a different parent. B. Some of this person's DNA is mutated, possibly causing disease. C. Chromosomes may not be completely replicated during S phase. D. The differences are a result of the way the material was prepared.
Prokaryotes are very important ecologically because of their involvement in all of the following except
A. STDs. B. denitrification. C. photosynthesis. D. nitrogen fixation. E. bioremediation.
What percentage of the earth's topsoil is lost to erosion each year?
A) 0.1 % B) 1% C) 10% D) 50% E) 100%
Green and purple bacteria
A) contain chlorophyll a like plants. B) give off oxygen as a product of photosynthesis. C) live in salt water. D) include species that use sulfur in photosynthesis.