Question

In: Biology

12. If a heterozygous dominant tall pea is crossed with a short plant, what is the...

12. If a heterozygous dominant tall pea is crossed with a short plant, what is the expected phenotype ratio?

13. Give three examples of phenotypes.

14. Why is skin color classified as polygenic inheritance?

15. If the parental genotype is EeWw, what are the potential allele combinations that could occur at the end of meiosis?

16. During DNA replication, a DNA strand with the bases CTAGGT will produce what complimentary strand of bases?

17. In their experiment, what would Hershey and Chase have concluded if radioactive sulfur was found in the bacteria?

18. If an organism's DNA contains 20% adenine nucleotides, what percentage of its DNA is composed of guanine nucleotides?

Solutions

Expert Solution

12. Heterozygous dominant tall plant w should have genotype Tt and short plant is tt. The resultant progeny on crossing will be Tt×tt are Tt and tt i.e one heterozygous tall and one short. Hence the phenotypic ratio will be 1:1

13. Examples of phenotypes are height( tall , short) , flower colour, flower position,seed shape , eye colour etc.

14. Skin colour is considered as polygenic trait because it is determined by atleast three genes and also other genes are said to influence it.

15. If the parental genotype is EeWw, the potential allele combination at the end of meiosis would be EW,Ew,eW and ew.

16. The complementary DNA strand produced by CTAGGT will have the bases GATCCA.

17. As the protein contains sulfur , if the radioactive sulfur was found in the bacteria , they would have concluded that protein is carried from generation to generation and not DNA. Means protein is a genetic material and not DNA.

18. If DNA contains 20% adenine nucleotides means the equal amount of its complementary nucleotides i.e thymine will also be present . Hence the total adenine and thymine nucleotides would be 40% . Now as DNA also contains cytocine and guanine means remaining 60% would be of these. As these both are also complementary hence among these 60% , 30% will be cytocine and 30% will be guanine nucleotide.

gladiator answered 2 years ago
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