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#Question id: 5099


Which of the following is common to the development of birds and mammals?

#SCPH01 Biochemistry
  1. the formation of an embryonic epiblast and hypoblast

  2. the formation of an embryonic trophoblast

  3. the formation of an embryonic yolk plug

  4. the formation of an embryonic gray crescent

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#Question id: 3266

#SCPH28 | Zoology

One species mates at the season when daylight is increasing from 13 hours to 13 hours, 15 minutes; another species mates at the season when daylight is increasing from 14 hours to 14 hours, 15 minutes. The isolating mechanism is

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#Question id: 3267

#SCPH06 I Botany

In a typical Mendelian population, individuals carrying gene ‘a’ in homozygous condition suffer from phenylketonurea. Those with A in homozygous condition are normal. Others, who are heterozygotic with Aa, are carriers. If the frequency of ‘a’ in a population is 0.20, what is the percentage of normal individual in the population?

TLS Online TPP Program

#Question id: 3267

#SCPH28 | Zoology

In a typical Mendelian population, individuals carrying gene ‘a’ in homozygous condition suffer from phenylketonurea. Those with A in homozygous condition are normal. Others, who are heterozygotic with Aa, are carriers. If the frequency of ‘a’ in a population is 0.20, what is the percentage of normal individual in the population?

TLS Online TPP Program

#Question id: 3268

#SCPH06 I Botany

A population of insects is in Hardy-Weinberg equilibrium for a gene with alleles A = orange and a = yellow eyes. There are 91% orange and 9% yellow individuals in the population. If the fitness of the yellow phenotype suddenly drops to zero, what will be the allele frequency in the next generation?

TLS Online TPP Program

#Question id: 3268

#SCPH28 | Zoology

A population of insects is in Hardy-Weinberg equilibrium for a gene with alleles A = orange and a = yellow eyes. There are 91% orange and 9% yellow individuals in the population. If the fitness of the yellow phenotype suddenly drops to zero, what will be the allele frequency in the next generation?

TLS Online TPP Program

#Question id: 3269

#SCPH06 I Botany

Two plant species live in the same biome but on different continents. Although the two species are not at all closely related, they may appear quite similar as a result of