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: 2651

#Unit 2. Cellular Organization

In the presence of lactose, how long does it take for the lac operon to be expressed?

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#Question id: 4307

#Unit 3. Fundamental Processes

When taken up by a cell, which of the following molecules binds to a repressor so that the repressor no longer binds to the operator?

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#Question id: 7293

#Unit 5. Developmental Biology

In agamous mutant (flower within flower phenotype) which of the following statements is valid?

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#Question id: 24182

#General Aptitude

People are now living longer than ever before for many different reasons.

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#Question id: 3033

#Unit 2. Cellular Organization

Which phase shows the reproduction rate equal to the equivalent death rate?