In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?

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#Question id: 815

#SCPH28 | Zoology

The cis conformation shows Cα atoms are on the same side of the peptide bond, is ∼8 kJ mol−1 less stable than the trans conformation. Why?

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#Question id: 5445

#SCPH28 | Zoology

A plant height in Maize is control by 3 pair of polygene .Two varieties of maize averaging 120 and 60 inches in height, respectively, are crossed. The F1 progeny is quite uniform averaging 90 inches in height. What is percent of F2 progeny that is resemble with either 120 cm or 60 cm height?

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#Question id: 3435

#SCPH06 I Botany

You turn on a light and observe cockroaches scurrying to dark hiding places. What have you observed?

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#Question id: 10411

#SCPH06 I Botany

Phytochrome chromophore which absorbs light known as Phytochromobilin , that are synthesized in

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#Question id: 1543

#I Life Science/ Life Sciences Group – I-V

Effector  cytokines of TH 1 cells?