Pure breeding lines of pea were taken regarding seed shape -Round and wrinkled and were crossed with no intermediate between parents. All offspring were found to be round. These results show:
Correct answer: B. Dominance-recessive relationship
- A. Codominance
- B. Dominance-recessive relationship
- C. Incomplete dominance
- D. Over dominance relationship
Explanation
The round phenotype is due to the presence of the dominant allele which expresses itself regardless of the presence of the recessive allele. All the offsprings are, apparently, heterozygous and inherited the dominant allele coding for the round shape hence all of them turned out to be round.
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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About Mendel's Laws of Inheritance
Mendelian inheritance explains how alleles separate into gametes and assort during reproduction, producing predictable genotype and phenotype ratios. Questions cover dominance, recessiveness, homozygous and heterozygous conditions, the laws of segregation and independent assortment, monohybrid and dihybrid crosses, test crosses and the limits caused by linked genes.
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