Question

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?

Answer 1

A) 80

B) 160

C) 160

D) 80

Step-by-step explanation:

Given-

Total number of chromosomes in Zebra finches
`= 80`

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

Hence,
`80` 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
`2*80 =160` chromatids in the metaphase in mitosis

C) Number of chromosome is equal to twice the number of chromosome i.e.
`2*80 =160`

D) During metaphase II of meiosis, the number of sister chromatids is equal to the total number of chromosome i.e
`80`