How does fitness relate to family size?
What will be an ideal response?
It depends on the ability of the children themselves to have children. Greater fitness is associated with larger families only if all or most of the progeny live to be reproductively successful. Survival is not enough.
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If the heterozygous genotype is favored (as exhibited by the sickle cell allele in malaria-prone regions), selection results in a ________ in which alleles reach stable equilibrium frequencies that are maintained by the ongoing action of selection
against the homozygous genotypes. Fill in the blank(s) with correct word
Which of the following statements concerning a blastodisc is false?
a. It can be further divided into an upper epiblast and below that, the hypoblast. b. It results from meroblastic cleavage. c. It is found in isolecithal eggs. d. It is a small disc of cytoplasm at the animal pole. e. It is characteristic of cell division in bird eggs.
According to the currently popular scientific theory for the origin of life, which of the following occurred before all of the others?
A. Eukaryotic organisms B. Oxygen in the atmosphere C. Prokaryotic organisms D. Photosynthesis
Mendel's Law of Segregation has its physical basis in which of the following phases of the cell cycle?
a) the orientation of homologous chromosome pairs in metaphase II of meiosis b) the separation of homologous chromosome pairs in anaphase II of meiosis c) the orientation of homologous chromosome pairs in metaphase of mitosis d) the separation of homologous chromosome pairs in anaphase I of meiosis e) the orientation of homologous chromosome pairs in metaphase I of meiosis