Answer:
mRNA plays a role in transcription of DNA to copy the DNA sequence to be transported out the the nucleus for transcription
tRNA plays a role in translation of mRNA. tRNA carries an amino acid corresponding to its anticodon sequence.
rRNA plays a role in the ribosomes to synthesize proteins from mRNA by incorporating tRNA amino acids and mRNA sequence.
A sudden change in a character/ gene / chromosomes of an organism is mutation.
Answer:
A very small number of bone cancers (especially osteosarcomas) appear to be hereditary and are caused by defects (mutations) in certain genes. Retinoblastoma is a rare eye cancer in children that can be hereditary. The inherited form of retinoblastoma is caused by a mutation (abnormal copy) of the RB1 gene. Those with this mutation also have an increased risk of developing bone or soft tissue sarcomas. Also, if radiation therapy is used to treat the retinoblastoma, the risk of osteosarcoma in the bones around the eye is even higher. Finally, there are families with several members who have developed osteosarcoma without inherited changes in any of the known genes. The gene defects that may cause cancers in these families haven’t been discovered yet.
They will most likely survive becuase stage one of bone cancer is the most treatable stage.
Answer:
Yes. You did it correctly.
Explanation:
The punnet square should be completed as follows:
T T
t Tt Tt
t Tt Tt
As the question says that the pollen carries the recessive alleles, hence the pollen should be carrying the alleles tt.
The question also says that all the offsprings produced are tall. Hence, the recessive male has to breed with a homozygous dominant female to get these results. The offsprings produced will be heterozygous dominant in this case.
