[問題] 普生問題兩題請解惑謝謝!

看板Biology (生物學)作者cttttc (cttttc)時間16年前 (2010/01/21 23:43)推噓1(1推 0噓 5→)

留言6則, 3人參與討論串1/1

【問題】1.what would be the fate of a Drosophila larve that inherits two copies of a mutant bicoid gene (one mutant allele from each heterozygous parent)? a. It develops two heads, one at each end of the larva. b. It develops two tails, one at each end of the larva. c. It develops normally but, if female, produces mutant larvae that have two tail regions. d. It receives no bicoid mRNA from the nurse cell of its mother. 手邊的答案是給A 2. Genetic analysis of a large population of mink inhabiting an island in Michigan revealed an unusual number of loci where one allele was fixed. Which of the following is the most probable explanation for this genetic homogeneity? a. The population exhibited nonrandom mating, producing a high proportion of homozygous genotypes. b. A very small number of mink may have colonized this island, and this founder effect and subsequent genetic drift could have fixed many alleles. c. The gene pool of this population never experienced gene flow. d. Natural selection has selected for and fixed the best adapted alleles at these loci. e. The colonizing population may have had much more genetic diversity, but very recent genetic drift may have fixed these alleles by chance. 答案是B 【個人看法】： 1. 很想選B 我知道bicoid gene 是母效基因。但是C的選項讓我讓我很困惑到底是要考什麼觀念? 2. 英文不好，其實看不太懂到底題目要問什麼麻煩了感謝 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 114.41.69.227

[問題] 普生問題兩題 請解惑 謝謝!

[問題] 普生問題兩題請解惑謝謝!