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In a given population, 1 out of every 400 people has a cancer caused by a completely recessive allele, b. Assuming the population is in Hardy-Weinberg equilibrium, which of the following is the expected proportion of individuals who carry the b allele but are not expected to develop the cancer? | [
"1/400",
"19/400",
"20/400",
"38/400"
] | [
"D"
] | [
3
] | [
"38/400"
] |
The presence of homologous structures in two different organisms, such as the humerus in the front limb of a human and a bird, indicates that | [
"the human and bird are polyphyletic species",
"a human's and bird's evolution is convergent",
"the human and bird belong to a clade",
"the human and bird developed by analogy"
] | [
"C"
] | [
2
] | [
"the human and bird belong to a clade"
] |
According to the pressure-flow model of movement of phloem contents, photosynthate movement from source to sink is driven by | [
"an ATP-dependent pressure-flow pump",
"a water-pressure potential gradient",
"transpiration",
"apoplastic diffusion"
] | [
"B"
] | [
1
] | [
"a water-pressure potential gradient"
] |
Which of the following contain DNA sequences required for the segregation of chromosomes in mitosis and meiosis? | [
"Telomeres",
"Centromeres",
"Nucleosomes",
"Spliceosomes"
] | [
"B"
] | [
1
] | [
"Centromeres"
] |
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