What phenotypic ratio would you expect as a result of a test cross between a dihybrid organism and one that is homozygous recessive for alleles at two independent loci?
a. 3:1
b. 9:3:3:1
c. 1:1:1:1
d. 1:2:1
e. 9:4:2:1
Answer:
c. 1:1:1:1
Explanation:
When a heterozygous individual for two genes is test crossed with a double homozygous recessive individual, the progeny is obtained in 1:1:1:1 phenotypic ratio. This occurs as the heterozygous dominant individual forms four types of gametes in 1:1:1:1 ratio while the homozygous recessive individual would form only one type of gamete having one recessive allele for each gene.
For example, a test cross between TtRr (tall and red) and ttrr (short and white) would produce a progeny in following ratio=
1 tall, red: 1 tall, white: 1 short, red: 1 short, white
Here, T= tall, t= short, R= red, r= white
Answer:
Translation.
Explanation:
The mRNA formed in the transcription process is transported out of the nucleus, then goes into the cytoplasm, and then to the ribosome. The ribosome is called the cell's protein synthesis factory.
In the ribosome, it directs protein synthesis. Messenger RNA is not directly involved in protein synthesis. Transfer RNA (tRNA) is required for this. The process by which mRNA leads to protein synthesis with the assistance of tRNA is called translation.
So we can say that the transfer RNA (tRNA) is used in the translation process.
<span>Prior to drawing blood for a blood donation, the nurse will clean the arm with a betadine solution. this form of antimicrobial control is called ANTISEPSIS.
Antisepsis is the practice of using antiseptics or antimicrobial substances to reduce or eliminate the possibility of infection by applying it to living tissue or skin.
Betadine solution is an antiseptic solution.</span>
It is inertia, Isaac Newton's first law of motion, also known as the law of inertia , states that an object at rest will stay at rest and an object in motion will stay in motion with the same speed and direction unless acted upon by unbalanced force.
