Answer:
610:190 round seeds: wrinkled seeds
Explanation:
A cross between two true breeds, involves crossing two parents that are each homozygous for the traits they carry.
A cross between a true breeding round parent (RR) and a true breeding wrinkled plant (rr), will produce all heterozygous offspring:
Rr : 100% in the F1 generation.
When these heterozygous offspring are crossed, Rr x Rr, the proportion obtained genotypically in the second filial generation is:
- 25% homozygous round (RR)
- 25% homozygous wrinkled (rr)
Considering the importance of dominance in phenotypic expression, round seeds being dominant over wrinkled seeds, indicates that about 75% of the offspring are expected to appear round and 25% expected to appear wrinkled. Putting this phenotypic proportion into perspective,
<em>610:190 round seeds:wrinkled seeds,</em> is the ratio in line with the proportion expected to see in the F2 generation.
No it is not. For example humans have 46 chromosomes and some dog breeds have 78.
Answer:
A. The chromatin near cis-regulatory sequences will be more closed and there will be less transcription.
Explanation:
In the presence of histones, the cis-regulatory sequences of DNA like promoter, enhancers etc. are not exposed. The function of the histone acetyltransferases (HATS) is to cause chromosome decondensation i.e. removal of histones from the DNA so that transcription of the DNA could occur. Histone acetyltransferases (HATS) cause acetylation of lysine amino acid of the histone proteins. Acetyl group is negatively charged so the acetylation of histone proteins leads to the removal of their positive charge which ultimately leads to the decrease in the interaction between N terminal of histones and negatively charged phosphate group of the DNA molecule. As soon as histones are removed from the DNA where cis-regulatory sequences are located, the DNA becomes accessible for transcription.
But here a drug has been added which blocks the activity of histone acetyltransferases (HATS) in cancer cells. So it is quite evident that in these cells, histones will not get removed from the cis-regulatory sequences of DNA so the DNA will be more closer or tightly packed as a result of which less transcription will occur.
Answer:
False
Explanation:
Punctuated equilibrium is that there is rapid change during short periods of time.
the brain is the main organ in the CNS it control the whole body its a common mistake to think the is a tissue and not an organ