Rice is one of the most widely consumed grain worldwide. As increasing global te

Question

Rice is one of the most widely consumed grain worldwide. As increasing global temperatures hamper rice production, scientists are searching varieties exhibiting some degree of heat resistance. The HT54 variety of the indica rice, Oryza sativa, was found to tolerate several days of high temperatures to 48 degrees Celsius (118 degrees Fahrenheit) during its growth. Researchers performed a genetic crossing experiment between the heat-resistant HT54 variety and a control variety, HT13, without heat resistance. All seedlings in the first generation survived a heat challenge of 48 degrees Celsius. In the second generation only 548 of the 744 plants survived the heat challenge. This would suggest heat resistance is carried by a single gene with a dominant allele and a recessive allele. Are the findings consistent with a simple dominant-recessive Mendelian gen etic model in which F2 is made up of 75% dominant-trait (heat resistance) and recessive-trait rice plants?

a)) Perform this test with a Z method.

Explanation / Answer

here from above : p=0.75

hence std error =(p(!-p)/n)1/2 where p=0.75 and n=744

=0.0159

phat=548/744=0.7366

here z stat =(phat-p)/std error =-0.8467

for above z stat ; p vlaue =0.1986

as p value is significant we can not reject that above follows  simple dominant-recessive Mendelian gen etic model

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