Chromosome #4, an autosome of the diploid smorglefuger, is rod-shaped and normal
ID: 67449 • Letter: C
Question
Chromosome #4, an autosome of the diploid smorglefuger, is rod-shaped and normally has its centromere positioned at one end (telocentric). A circular variant of this chromosome exists, and except for the lack of physical ends (telomeres) of the chromosome, it is identical in genetic content to the rod-shaped variety; therefore, the two variants will synapse normally. The position of five genes (a-e) on the two forms of this chromosome are shown below; the five genes are all equally spaced along the chromosome.
Here are three different females of the genotype a+b+c+d+e+/a b c d e. The structures of their homologous pair of chromosome #4 are indicated. Each of these types of female is testcrossed to homozygous a b c d e males that carry chromosome #4 only as its normal rod form.
Everything else being equal, which, if any, female type(s) will produce the highest fraction of phenotypically a+b+c+d e progeny?
Select all that apply.
female A
female B
female C
none will produce those progeny
Everything else being equal, which, if any, female type(s) will produce the highest fraction of phenotypically a b c d+e individuals?
Select all that apply.
female A
female B
female C
none will produce those progeny
a bcd e normal rod form circular form ·=centromere e la b c d e he structures of their homologous pair of chromosome #4 a e indicated ach of these es of ema eistes crossed to homoz g usabcdema e that Here are three different emales of the genotype a b c chromosome #4 only as its normal rod form ar A: rod #4/rod #4 B; rod #4/circular #4 c: circular #4/circular #4Explanation / Answer
Definitely rod/rod female will produce because rod being the normal chromosome and is associated with both the parents. However, the circular chromosome lacks the terminal part of the chromosome (telomere), clearly demarcates the instability of the chromosome and would not be able to properly involved in the process and ends with incomplete replication or apoptosis results.
Hence the answer is Female A.