In some sheep, the presence of beard is produced by an autosomal allele that is dominant in males and recessive in females. A beard female is crossed with a homozygous beardless male. One of the resulting F1 females is crossed with a beardless male. What proportion of the male and female progeny from this cross will have beard in F2 generation?

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#Question id: 7021

#Unit 5. Developmental Biology

The tracheal (respiratory) system in Drosophila embryos develops from epithelial sacs. The approximately 80 cells in each of these sacs become reorganized into primary, secondary, and tertiary branches without any cell division or cell death. This reorganization is initiated when nearby cells secrete a protein called Branchless, which acts as a:

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#Question id: 7022

#Unit 5. Developmental Biology

Two teratogens known to cause cyclopia in vertebrates are jervine and cyclopamine. Both targets hedgehog pathway. Both teratogens inhibits:

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#Question id: 7023

#Unit 5. Developmental Biology

When Chordin mRNA is injected into the dorsal region of Drosophila embryos, it induces:

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#Question id: 7024

#Unit 5. Developmental Biology

Which of the floral whorls is affected in apetala 3/pistillata (ap3/pi) mutants?

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#Question id: 7025

#Unit 5. Developmental Biology

Many reptile groups initiate gastrulation by migration through an amphibian- like blastopore, avian and mammalian gastrulation takes place through the:

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#Question id: 7026

#Unit 5. Developmental Biology

humans with homozygous mutant alleles of HOXA13  have: