During mitosis, a single cell divides to produce two daughter cells. what must happen in the original cell so that each of the daughter cells has a complete set of chromosomes?
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Ответ:
The original cell must reproduce sexually. But since this is one cell, it is called assexual reproduction. Asexual reproduction is when something reproduces by itself.
Ответ:
a. M_D_ : 9/16 Black furred individuals
b. M__dd : 3/16 gray furred individuals (1/16 MMdd + 2/16 Mmdd)
c. mmD_ : 3/16 Brow-furred individuals (1/16 mmDD + 2/16 mmDd)
d. mmdd: 1/16 gray furred individuals.
Explanation:
Available data:
Dense pigment gene, D, codes for melanophilin.D allele dominant over d. Gene M/m is responsible for the production of the pigmentM is dominant over mIf D is present, M/m is expressedIf dd is present, M/m is not expressed DDMM, DdMM, DDMm, DdMm --->Black furDDmm, Ddmm ---> Brown furddMM, ddMm > Light gray furCross: between two dihybrids
Parental) DdMm x DdMm
Phenotype) Black-furred Black-furred
Gametes) DM, Dm, dM, dm DM, Dm, dM, dm
Punnet Square) DM Dm dM dm
DM DDMM DDMm DdMM DdMm
Dm DDMm DDmm DdMm Ddmm
dM DdMM DdMm ddMM ddMm
dm DdMm Ddmm ddMm ddmm
F1) 9/16 Black-furred individuals, D-M- (1/16 DDMM + 2/16 DDMm + 2/16
DdMM + 4/16 DdMm)
3/16 Brown-furred individuals, D-mm ( 1/16 DDmm + 2/16 Ddmm)
4/16 Gray-furred individuals, dd-- ( 1/16ddMM + 1/16 ddmm + 2/16 ddMm)