Please Help me with these two questions Beadle crossed maize

Please Help me with these two questions

Beadle crossed maize and teosinte to produce an F1. He then crossed the F1 to produce an F2. He observed that approximately 1 in 500 plants looked like maize, and 1 in 500 looked like teosinte. What did Beadle conclude from this experiment? Changes in as few as 4-5 genes could explain the phenotypic differences between maize and teosinte, suggesting teosinte could be the wild ancestor of maize. The hybrid of maize and teosinte was euploid, and thus the two species produced fertile offspring. Linkage was likely, given that there were few F2 progeny with the parental phenotype. Blending inheritance was unlikely to explain the results, given the reemergence of the parental phenotype in the F2. Linkage produces greater-than-expected numbers of what? Parental allele combinations Recessive alleles Dominant alleles Mutant alleles Recombinant alleles

Solution

Answer to the 1st one - Question 28

Beadle\'s experiments with teosinte and maize had proved that, even as few as around 5 major mutations in teosinte could transform it to maize. Thus suggesting that the correct answer is the 1st option - that teosinte is a wild ancestor of maize.

Option 2 doesnt seem to be relavent to this experiment (option 2 is wrong).

Option 3 - regarding linkage, since there were only 0.4% parental phenotype in the F2 generation, the question of linkage can be completely removed (option 3 is wrong).

Option 4 - In this experiment of Beadle, blending inheritence was not observed, instead pleiotropy was observed (option 4 is wrong).

Answer to the 2nd one - Question 29

Linkage produces greater than expected numbers of parental allele combinations (option 1 is correct).

Linkage is a phenomenon where the genes tend to be inherited together. Thus the parental combination appear as such in the progeny too. Therefore the proportion of parental combinations remain much higher in the progeny.

Options 2, 3 and 4 are wrong. Which ever of these are present in the parental genotype, progeny tends to inherit the same as the parent.

Option 5 is also wrong because in linkage recombinants are always less in number when compared to the number of parental combinations.