What is the ?2 value for a chi-square test for goodness of fit of the null hypothesis?

In Drosophila, singed bristles (sn) and carnation eyes (car) are both caused by recessive X-linked alleles. The wild-type alleles (sn+ and car+) are responsible for straight bristles and red eyes, respectively. A sn car female is mated to a sn+car+ male and the F1 progeny are interbred. The F2 are distributed as follows:











A) 0.5

B) 1.0

C) 2.0

D) 0.4

E) 20


C) 2.0

Biology & Microbiology

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Has this cell undergone meiosis?

a. yes, because there are no duplicated chromosomes b. no, because homologous chromosomes are present c. yes, because homologous chromosomes are not present d. no, because the diploid number is 2

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The hormonal controls over excretion occur in the

a. Bowman’s capsule. b. proximal tubule. c. distal tubule and collecting duct. d. loop of Henle. e. urinary bladder.

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Symbiosis is an interaction between two species that is beneficial to both species

Indicate whether the statement is true or false

Biology & Microbiology

Sympathetic and parasympathetic nervous system responses usually oppose each other

Indicate whether the statement is true or false

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