Answer: The combination produced is RRtt.
The combination rrTt does not appear in this punnett square.
Explanation:
As the problem does not indicate more information, I assume that punnett square is made between two RRtt genotypes. It can produce gametes that have the alleles Rt. A gamete is a sexual cell (egg or sperm) that has only one allele of each gene. And, each gamete codes for a different gene. Since here we have two different types of alleles (R and t), it is a dihybrid cross.
A Punnett square is a diagram used to predict the genotypes of a cross or breeding experiment. It is used to determine the genotypes and phenotypes of the offspring. To do it, you have to label the rows with one parent's gametes and label the columns with the other parent's genotype. Then, have each box inherit letters from its row and column, and interpret the results.
Then, the punnett square (shown in the picture) will be between RRtt and RRtt whose gametes can only be Rt, so Rt x Rt will be made.
The result in an offspring which will be 100% RRtt, and there is no rrTt combination here because non of the parents have an r allele, then none of the children can inherit it.
To have an offspring where rrTt genotype is shown, a different genotype must be used, in which both parents must have at least one r allele and one t allele. For example, it could be Rrtt x rrTt.
B. Macrophages
C. Lysozymes
D. T cells
Ans. (D). T cells.
Immune responses are reactions of immune cells and substances against foreign substances or abnormal cells.
Specific immune responses are elicited by adaptive immune system, which is made up of T-lymphocytes and B-lymphocytes. These cells are highly specialized that function in elimination of pathogens and prevent their growth.
Thus, the correct answer is option (D).
Condensing
Freezing
Solidifying
B. churning movements of the gastrointestinal tract
C. pendular movements of the gastrointestinal tract
D. waves of muscular contractions that propel contents from one point to another
Answer:
Option (D).
Explanation:
Peristaltic movements are involuntary movement occur due to the longitudinal and circular muscle.Peristaltic waves helps in the passage of food from one point to another during the process of digestion.
Peristaltic waves occur mainly due to muscular contraction. These contractions propel the contents from one location to another. These waves occur in stomach, intestine and esophagus.
Thus, the correct answer is option (D).
Peristaltic waves are waves of muscular contractions that propel contents from one point to another. Therefore, the option is D.
The waves of muscular contractions known as peristaltic waves are responsible for moving materials from one location to another. They are in charge of the transportation of food through the digestive system from beginning to end.
Therefore, peristaltic waves are waves of muscular contractions that propel contents from one point to another
Learn more about peristaltic waves, here:
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