Answer:
17
Explanation:
In corn,
Smooth kernel (S) is dominant to rough kernel (s)
Purple kernel (P) is dominant to yellow kernel (p)
Since no information has been given about the cross here let us assume it to be a standard dihybrid cross.
The phenotypic ratio of dihybrid cross is 9:3:3:1. 9/16 will show dominant phenotype for both traits, 3/16 will show dominant phenotype for one trait, other 3/16 will show dominant phenotype for the second trait, 1/16 will have recessive phenotype for both the traits.
Here,
Purple rough (P_ss) = 52
Yellow smooth (ppS_) = 50
Both of them show dominant phenotype for one trait so they each form 3/16 of the progeny.
If the total progeny was z, 3/16*z = 50
z = (50*16)/3 = 267
Total progeny = 267 kernels
Yellow rough kernels (ppss) = (1/16*267) = 17
So approximately 17 corn kernels will be yellow and rough.
Answer:
The process of extracting the DNA is a very complex, time taking and tedious task. It needs lots of technical knowledge in order to extract DNA.
There are various chemicals used during the process of DNA extraction. The use of isopropyl alcohol is to precipitate the DNA.
This precipitation makes the DNA visible as it is clumped together. Then it becomes easy for the long strands of DNA to wrap around the stirrer when swirled at the interface between two layers.
Answer:
A. Done some research
Explanation:
You need to have an idea of what you are working with. So, to make a good hypothesis, you need to have an idea on what the experiment is. The hypothesis comes before you design a procedure or even start working on the experiment.
And BTW, you can't logically do option D. Science doesn't work that way. The Scientific Method is used to collect observations and evidence and piece them together to come to a conclusion.
Hope that helped. :)
Answer:
False
Explanation:
The zygote is endowed with genes from two parents, and thus it is diploid (carrying two sets of chromosomes). The joining of haploid gametes to produce a diploid zygote is a common feature in the sexual reproduction of all organisms except bacteria.
Gametes are haploid cells, and each cell carries only one copy of each chromosome. These reproductive cells are produced through a type of cell division called meiosis.
Answer:
Valves in the veins keep blood flowing in the correct direction.
