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: 9249

#Unit 9. Diversity of Life Forms

Which of the following strategies would most rapidly increase the genetic diversity of a population in an extinction vortex?

TLS Online TPP Program

#Question id: 9250

#Unit 9. Diversity of Life Forms

Of the following statements about protected areas that have been established to preserve biodiversity, which one is not correct?

TLS Online TPP Program

#Question id: 9566

#Unit 10. Ecological Principles

Which of the following adaptations helps kangaroo  rats conserve water?

TLS Online TPP Program

#Question id: 9567

#Unit 10. Ecological Principles

Which part of the electromagnetic spectrum is the photosynthetically active region?

TLS Online TPP Program

#Question id: 9568

#Unit 10. Ecological Principles

Which of the following represents a plant adaptation that minimizes water loss in arid environments by increasing the thickness of the boundary layer?

TLS Online TPP Program

#Question id: 9569

#Unit 10. Ecological Principles

Certain thermophilic bacteria live in hot springs at temperatures close to the boiling point of water. What challenges do such bacteria overcome successfully?