Answer: A) Black trait is dominant
B) The genotypes of the parents must be Bb
Explanation: Let B represent the allele for black colour and b represent the allele for white colour. If the offspring between 2 black mice show the ratio of 3 black mice to 1 white mouse, it then means that the two parents are heterozygous for black colour, that is each of them have one allele for black colour (B) and one allele for white colour (b). They both have a genotype of Bb.
Bb x Bb = BB, Bb, Bb, and bb.
This means 1BB : 2Bb : 1bb
BB is black, Bb is black while bb is white which gives a ratio of 3 black mice to one white mouse. For Bb to manifest as black, it means that B is dominant to b.
A bird with mutation that made its beak stronger so that it can now crack many different types of nuts.
It is C. Advantageous mutation as it provides an advantage.
Cells that are produced by meiosis are best described as C. Gametes;haploid as they only have half the number of chromosomes.
A cell from the same organism have the same D. DNA.
By definition, C. Crossing over only occurs in meiosis that does not happen in mitosis.
Cryo=a
atmosphere =b
biosphere =d
hydro=e
litho=c
Answer: Much like the processes of DNA replication and transcription, translation consists of three main stages: initiation, elongation, and termination. Initiation takes place with the binding of a ribosome to an mRNA transcript.
1. Atoms and molecules
2. Cells
3. Tissue
4. Organ systems
5. Organs
