1. May be due to a mutation in the allele coding for white colour, which results in an allele coding for yellow colour in the flowers.
2. The original white flower that was isolated may have been heterozygous, Ww, where W codes for the white pigment in flowers, and W is dominant to w. The crossing of Ww × Ww will give offspring with genotypes of WW, Ww, Ww, ww, genotypic ratio of 1:2:1, and phenotypic ratio of 3 white :1 yellow. The offspring with the yellow flowers has a genotype of ww, homozygous recessive.
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The statements that describe active transport are as follows:
- At the end of the process, a larger concentration of substances is on one side of cell membrane than the other.
- uses ATP (energy) from cell
- move substances from low to high concentrations
<h3>WHAT IS ACTIVE TRANSPORT?</h3>
Active transport is the process whereby molecules or substances are moved from a region of lower concentration to a region of higher concentration across a membrane.
Active transport moves molecules against a concentration gradient, hence, requires the input of energy for it to occur.
Based on the above explanation, the statements that describe active transport are as follows:
- At the end of the process, a larger concentration of substances is on one side of cell membrane than the other.
- uses ATP (energy) from cell
- move substances from low to high concentrations
Learn more about active transport at: brainly.com/question/2503897
BE CAREFUL. Here we ask about the nucleolus precisely and not about the nucleus in general, the precise role of the nucleolus is to assemble the ribosomal RNA and the ribosomal proteins to form the ribosomes. So the answer is B.
In cell biology, the nucleolus is the largest nucleus subcompartment of eukaryotic cells. This particular space of the nucleus is not delimited by a membrane, nevertheless some authors consider it as an organelle and others do not. The number of nucleoli can vary during the cell cycle (usually only 1 in G0 phase).
The nucleolus is composed of proteins, DNA and RNA and is formed around particular chromosomal regions called NOR (Nucleolar Organizing Regions).
It is in particular the place where the transcription of the ribosomal RNAs (5.8S, 18S and 28S rRNA), the processing of these ribosomal RNAs from precursors and the first part of the assembly of the two ribosome subunits takes place. with the association of certain ribosomal proteins. The end of the ribosome assembly occurs in the cytoplasm on mRNA after export of pre-ribosomes through the nuclear pore.