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?

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#Question id: 6969

#Unit 5. Developmental Biology

In Xenopus, the elongation of the mesoderm toward the anterior results from the intercalation of cells during a process called:

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#Question id: 6970

#Unit 5. Developmental Biology

Neural crest cells will become:

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#Question id: 6971

#Unit 5. Developmental Biology

Neural crest cells taking the dorso-lateral route will become:

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#Question id: 6972

#Unit 5. Developmental Biology

Sodium ions influx and passive water movement result in fluid-filled blastocoel in __________embryos.

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#Question id: 6974

#Unit 5. Developmental Biology

Where are the stem cells that renew the epithelium of the gut found?

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#Question id: 6975

#Unit 5. Developmental Biology

Which one of the following genes was NOT part of transcription factors used to generate induced pluripotent stem (iPS) cells from mouse skin fibroblasts?