Of these 4 genotypic classes of offspring, which arose from a parental gamete produced by the F1 females? (Select all that apply.)

In Drosophila, singed bristles (sn) and cut wings (ct) are both caused by recessive, X-linked alleles. The wild type alleles (sn+ and ct+) are responsible for straight bristles and intact wings, respectively. A female homozygous for sn and ct+ is crossed to a sn+ct male. The F1 flies are interbred. The F2 males are distributed as follows:







A) sn+ ct+

B) sn ct

C) sn+ ct

D) sn ct+


C) sn+ ct, D) sn ct+

Biology & Microbiology

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A genus of primarily wind-pollinated plants includes one unusual species that has evolved to be pollinated by insects. Several morphological changes have accompanied this adaptation. The ______________ are more colorful, there is a nectary at the base of the ______________, the ________________ are shorter and produce sticky pollen, and the __________________ are stickier for enhanced pollen capture.  

A.  petals, stamens, sepals, carpels B.  petals, sepals, stamens, carpels C.  stamens, carpels, petals, sepals D.  petals, sepals, carpels, stamens

Biology & Microbiology

The term used to describe bacteria that have a spherical shape is

A. vibrio. B. bacillus. C. coccobacillus. D. coccus.

Biology & Microbiology

Briefly explain some of the advantages and disadvantages of living in social groups

What will be an ideal response?

Biology & Microbiology

ATP is to the cell as __________ is(are) to the

financial community. a. printed currency b. checks c. credit d. gold reserves e. automated tellers

Biology & Microbiology