Please help me with this difficult Biology multiple choice questions. You don\'t

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Please help me with this difficult Biology multiple choice questions. You don't have to explain but just mark the correct answer. Thank you, much appreciated.

List the cell types (multipotent, pluripotent, and totipotent) in order from those capable of differentiating into the greatest number of different specialized cells to those capable of differentiating into the least number of different specialized cells? What cell (type) has the greatest developmental potential? a.) inner cell mass b) gas c.) fertilized egg d.) ectoderm e.) nerve cells trula Drosophila has two kinds of eye pigments, scarlet red and brown. Wild-type flies have both pigments showing the wild-type brick red. The scarlet (st) gene encodes a transporter for brown eye pigment precursor on the pigment granules. The brown (bw) gene encodes a transporter for scarlet eye pigment precursor on the pigment gran st single mutants show (?)eye color, and bw single mutants show eye color. Then, bw st double mutants show eye color. a.) scarlet red; brown; brick red b.) brown; scarlet red; white c.) scarlet red; brown; white d.) brown; scarlet red; brick red When cytosine residues in ands are methylated: a. transcription is active and rapid b.) transcription is active, but slow c.) translation is repressed d.) transcription is repressed. e.) translation is active and rapid You caught a Drosophila female in your backyard. She looked normal (wild type morphology) Apparently, she had mated with a male. You let her lay eggs in a culture vial. Two weeks later, you observed her offspring. All of them looked normal. However, the number of males was about 50% of females. This observation suggests: a.) One of her X-chromosomes had a dominant mutation of an essential gene for life b.) One of her X-chromosomes had a recessive mutation of a gene for eye pigment synthesis. c.) One of her X-chromosomes had a recessive mutation of an essential gene for vision d.) One of her X-chromosomes had a recessive mutation of an essential gene for life The genotype of a yellow and round seed of pea plants is AaBb. What are gamete genotypes of the plant for this seed? a.) AABB, aaBB, AAbb, aabb b.) Ab, AB, aB, BB c.) AB, Ab, aB, ab d.) AB, AA, ab, bb Which statement below is true for calico cats? a.) They are all males. b.) They are homozygous for a coat color gene c.) They always show identical tricolor patterns. d.) They are good examples of dosage compensation in mammals. Their tricolor patterns becomes different during adulthood

Explanation / Answer

1. c (fertilized egg)

2. st single mutants show brown colour; bw single mutants show scarlet color; double mutants show white colouur.

b (brown, scarlet, white)

3. methylation of cytosine in CpG islands causes transcriptional repression

d (transcription is repressed)

4. d (one of her X-chromosome had a reessive mutation of an essential gene for life)

since females contains two X chromosomes, the chance of each X fusing with Y chromosome and form male is 50%. recessive mutation in X behaves as a dominant mutation in males. therefore 50% males would not survive.

5. the gametes should have all the possible combinations of two alleles.

i.e, c (AB, Ab, aB, ab),

6. d

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