Kidney __________ are small, tubular structures that interact with nearby capillaries to form urine. Fill in the blank(s) with the appropriate word(s)
ANSWER: nephrons
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Which of the following statements about infanticide
is true? a. It may decrease the reproductive success of the male lion that carries it out. b. It occurs in very few human cultures. c. The presence of a male unrelated to a child in an American household and the absence of the biological father significantly increase the child’s risk of dying by age two. d. A mother might decrease her fitness by infanticide in a situation where resources or social attachments are absent. e. None of these are true.
There are nine coat colors known in foxes. If a red fox were crossed with a double-black fox, all the
hybrids would be red above and black below in a pattern known as a blended cross. If two blended crosses were mated, the F2 ratio would be as follows: 1 red, 2 smokey red, 2 cross red, 4 blended cross, 1 standard silver, 2 substandard silver, 1 Alaskan silver, 2 sub-Alaskan silver, and 1 double-black. (a) Using the letters A/a and B/b to serve as the genes for these animals, develop a genotype for each variety listed. (b) Two crosses will produce all blended-cross offspring. One is used above (red fox ? double-black); what is the other? (c) List the genotype and phenotype of all the pure-breeding foxes. (d) Give the genotypic and phenotypic ratio of a cross between two substandard silvers. (e) Give the genotype and phenotype of the offspring produced in a cross of 1 sub-Alaskan silver and a cross red. What will be an ideal response?
Hemophilia is an X-linked trait caused by the allele h. About 1 in 10,000 males (.0001) has
hemophilia. The frequency of h, therefore, is ____________________. Fill in the blank(s) with the appropriate word(s).
If your parents are heterozygous for a gene, what is the chance that you will have at least one copy of it?
A) 0% B) 75% C) 25% D) 50%