In tomatoes, red (R) is dominant to yellow (r), tall (D) is dominant to dwarf (d), and smooth (H) is dominant to peach or hairy (h)
(a) How many different genotypes are there in relationship to these three characteristics?
(b) How many different phenotypes are there in relationship to these three characteristics?
(c) How many different homozygous pure-breeding forms can be produced?
What will be an ideal response?
ANSWER: (a) 27
(b) 8
(c) 8
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What accounts for the fact that polydactylism is prevalent and Tay-Sachs disease is virtually absent in one human population in the United States, while Tay-Sachs disease is prevalent and polydactylism is virtually absent in another?
a. Natural selection has promoted these differences since humans live in many different environments. b. Mutation rates differ among different loci. c. There is little gene flow between the two populations. d. The populations are small, and therefore genetic drift is a major factor in the determination of allele frequencies. e. The alleles are fixed in these populations.
Which specific autoimmune disease involves neuroglial cells?
a. cerebral palsy b. rheumatoid arthritis c. Grave’s disease d. multiple sclerosis e. lupus
The last known population of Neanderthals lived as recently as ____ years ago.
A. 8,000 B. 18,000 C. 28,000 D. 38,000 E. 48,000
Telomeres are necessary because:
a. RNA needs a DNA template. b. Okazaki fragments need a binding region. c. prokaryotic genomes are circular. d. DNA polymerase only works 5' -> 3'. e. chromosomes would grow during each replication.