The zebra finch (Taeniopygia guttata) is a songbird used as a model organism to study behavior, neurobiology, toxicology, endocrinology, and genetics. Zebra finches are diploid with a total of 80 chromosomes (2n=80). (1pt)a. How many chromosomes are present in a cell during G1 of interphase?b. How many sister chromatids are present in a cell during metaphase in mitosis?c. How many chromosomes are present in a cell during anaphase in mitosis?d. How many sister chromatids are present in a cell during metaphase II of meiosis?

A) 80

B) 160

C) 160

D) 80

Explanation:

Given-

Total number of  chromosomes in Zebra finches

A) During the G1 phase, a cell synthesizes mRNA. Thus the number of chromosome and chromatid remains the same.

Hence, chromosomes are present in the G1 phase of the cell division.

B) During meta phase,  the number of sister chromatids is equal to twice the number of chromosomes.

Hence, there will be   chromatids in the metaphase in mitosis

C) Number of chromosome is equal to twice the number of chromosome i.e.

D) During metaphase II of meiosis, the number of  sister chromatids  is equal to the total number of chromosome i.e

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.