Developmental Biology 1. In an attempt to explore the role of bicoid protein in

Question

Developmental Biology 1. In an attempt to explore the role of bicoid protein in positional development of Drosophila melanogaster, a developmental biologist at university X, transplanted bicoid protein from wild type Drosophila melanogaster eggs (donor) to the posterior end of bicoid deficient Drosophila melanogaster eggs (recipient). Which of the following statements is correct based on your understanding of the role of bicoid in development of the flies? A: the embryo of the recipient fly developed posterior structures at the posterior end B: the embryo of the recipient fly developed anterior structures at the posterior end C: the embryo of the recipient fly developed posterior structures in the posterior end D: the embryo of the recipient fly developed the mid-section structures at the posterior E: the embryo of the donor fly developed posterior structures at the anterior end 2. Eggs with heavier deposit of yolk on the vegetal hemisphere compared to the animal hemisphere would undergotype of cleavage A: holoblastic B: meroblastic C: vegetal cleavage D: animal cleavage E: none of the above 3. Although normal female cells have two X-chromosomes and normal male cells have only one X-chromosome, male and female cells have equal X-encoded gene products. This equalization is due to which of the following: A: genomic imprinting B: sex determination C: dosage compensation D: presence of the Y-chromosome in males that is absent E: none of the above 4. Fertilization is immediately followed by rapid mitotic cell divisions generally known as -- that result in production of progressively small cells known as A: gastrulation, somatic cells B: meiosis, mesenchymal cells C: cleavage, blastomeres D: clea E: organogenesis, epithelial cells vage, primordial germ cells

Explanation / Answer

Bicoid protein assist in development of anterior structure in posterior end. Hence, option B is correct.

2. Holoblastic cleavage result when egg have moderate to sparse amount of yolk. Meroblastic cleavage is partial cleavage. Hence, option B is correct.

3.Dosage compensation is a which equalizes the expression of sex link genes. Hence, option C is correct.

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