Below is a pedigree of a human genetic disease in which solid color indicates affected individuals. Assume that the disease is caused by a gene that can have the alleles A or a. If individuals 2 and 3 have a child together, what is the probability that the child will exhibit the disease?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%
A) 0%
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Which chemicals are natural pain suppressors?
a. substance P b. bradykinins c. prostaglandins d. histamine e. endorphins
Which species likely co-existed with Neanderthals?
a. Au. sediba b. H. habilis c. H. erectus d. H. sapiens e. H. heidelbergensis
Tallness (T) in snapdragons is dominant to dwarfness (t), while red (R) flower color is dominant to white (r). The heterozygous condition results in pink (Rr) flower color. A dwarf, red snapdragon is crossed with a plant homozygous for tallness and white flowers. What are the genotype and phenotype of the F 1 individuals?
A) ttRr-dwarf and pink B) ttrr-dwarf and white C) TtRr-tall and red D) TtRr-tall and pink E) TTRR-tall and red
The microbes commonly known as ________ are single-celled eukaryotes that are generally motile
A) archaea B) bacteria C) fungi D) protozoa E) viruses