6 points

Why is virus considered as connecting link between living and non living?

Anastaziya [24]

Virus is non living, but once it gets a host (something to live on), it is a living being.

5 0

3 years ago

In rna adenine pairs with uracil

dimaraw [331]

Answer:

That is true

Explanation:

Adenine pairs with Uracil and Cytosine pairs with Guanine. A-U and G-C

5 0

3 years ago

Which of these sentences describe sources and preservation of genetic variation? Select all that apply.

saul85 [17]

Genetic variation can be defined as the difference in the DNA sequences between the individuals in the population

<u>Explanation:</u>

Antibiotic resistance in bacterial populations is caused by natural selection of bacteria that inherit mutations that make them resistant to the antibiotics,this sentence describes the source and preservation of genetic variation.
The Mutation is one of the genetic variation or disorder, and probably bacteria choose mutation to become repellent to antibiotics
In some of the cases of spontaneous bacteria have been obtained from other sets of bacteria through the process and make the bacteria repellent to an antibiotic.
They survive antibiotic treatment and increase in numbers by natural selection.
Natural selection can be stated as the process in which organism survive and reproduce adapting to the environment

6 0

3 years ago

Given the following cross TtYyRr x TtyyRr (T = tall; t = short Y = yellow; y = green R = round; r = wrinkled), what proportion o

mihalych1998 [28]

Answer:

3/32 ttyyR-

Explanation:

Cross: Tall, Yellow, Rounded individuals with a tall, green, rounded individual

Parentals) TtYyRr x TtyyRr

Gametes) TYR, TyR, TYr, Tyr, tYR, tyR, tYr, tyr (Parent one)

TyR, TyR, Tyr, Tyr, tyR, tyR, tyr, tyr (Parent two)

We need to know what proportion of offspring is expected to be short plants with round, green seeds. So we need to identify the gametes for these traits. The genotypes are:

Shot → tt
Round → RR or Rr
Green → yy

⇒ Parent one can provide gametes tyR and tyr

⇒ Parent two can provide gametes tyR and tyr

(1/8 tyR x 2/8 tyR) + (1/8 tyR x 2/8 tyr) + (1/8 tyr x 2/8 tyR) =

2/64 ttyyRR + 2/64 ttyyRr + 2/64 ttyyRr =

1/32 ttyyRR + 2/32 ttyyRr =

3/32 ttyyR-

4 0

3 years ago

Suppose these two chromosomes are found in a cell nucleus during prophase. what is the relationship between chromatids a, b, c,

Musya8 [376]

In this image we can see that A is identical to B, and C is identical to D.

Chromatid (Cht) is a DNA molecule (the nucleofilament) associated with histone proteins (PH) and non-histone proteins (PNH)
<span>Each chromosome of a cell may consist of one or two chromatids depending on its state: just after a mitosis, or after the second meiotic division, each chromosome consists of only one chromatid, the rest of the time, after DNA replication, each chromosome consists of two completely identical chromatids, connected by the centromere, thus giving the two rods the shape of an X.</span>

3 0

4 years ago