Shell coiling of the snail Limnaea peregra(genetic maternal effect)  the shell coils (s+s+) which is termed dextral coiling, while some snails exhibiting sinistral coiling (ss). The allele for dextral (s +) is dominant over the allele for sinistral (s). If a male homozygous for dextral alleles (s+s+) is crossed with a female homozygous for sinistral alleles (ss) all of the F1 are heterozygous (s+s) and have a sinistral shell. If these F1 snails are self-fertilized, what is the phenotype of the F2 snail?

TLS Online TPP Program

#Question id: 23044

#Unit 12. Applied Biology

Rhizosphere biodegradation depends on relationships between green plants and _____.

TLS Online TPP Program

#Question id: 3394

#Unit 11. Evolution and Behavior

All genetic drift arises from sampling error.  There are several different ways in which sampling error can arise as a following

a. Reduced population size      b. Founder effect

c. Genetic bottleneck                d. Differ in sex ratio

Which of the following above way cause sampling error in succeed generation?

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#Question id: 4620

#Unit 11. Evolution and Behavior

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?

TLS Online TPP Program

#Question id: 26520

#Unit 3. Fundamental Processes

RNA polymerase I synthesizes rRNA in the

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#Question id: 15415

#Unit 5. Developmental Biology

Which of the following statements are regarding to Pax6 is correct?