Biology Answers

In the common fruit fly Drosophila melanogaster (that you find around your fruit and vegetables at home) clear wings is dominant over patterned wings. Fruit flies can have red eyes, white eyes and sometimes pink eyes. A male fruit fly Beelzebub is heterozygous for clear wings and has red eyes. He mates with a female fruit fly Jezebel who is homozygous recessive for patterned wing and has white eyes.Write a let statement, State the genotype of the parents, show the Punnett square and probabilities for phenotypes of the offspring. 

You are breeding rare unicorns for two traits: colour and tail length. You know from your experience that if you take a purebred blue unicorn and cross it with a purebred yellow unicorn all of the offspring are green unicorns. For tail length, you know that long tails are dominant over short tails. You cross a unicorn that is green and has a short tail with one that is green and has a long tail(heterozygous). What is the F1 generation? 

The gene for the human protein albumin spans a

chromosomal region 25,000 nucleotide pairs (25 kilo-

bases, or kb) long from the beginning of the protein-coding sequence to the end of the protein-

coding sequence, but the messenger RNA for this protein is only 2.1 kb long. What do you think accounts

for this huge difference?

How to determine the bacteria species based on DNA sequence. Choose one DNA sequence and elaborate how you identify the bacteria.

The events which occur in both mitosis and meiosis are similar except during

• The first interphase

• chromosomal duplications

•none of these choices

•anaphase

A skin cell of a mouse has 22 chromosomes. How many chromosomes would you expect to find in

a) an unfertilized egg cell of a mouse

b) A zygote of a mouse

The sodium/calcium exchanger (NCX) transports sodium into and calcium out of

cardiac muscle cells. Describe why this transporter is classified as secondary active

transport.

Make any two monohybrid cross, write the genotypic and phenotypic ratio.

Q.2: The gene for the human protein albumin spans a chromosomal region 25,000 nucleotide pairs (25 kilo-bases, or kb) long from the beginning of the protein-coding sequence to the end of the protein-

coding sequence, but the messenger RNA for this protein is only 2.1 kb long. What do you think accounts

for this huge difference?

How many and what kinds of free nucleotides will be required for replication of a DNA molecule in which the amount of adenine is 600,000 and guanine is 2,400,000?