In summer squash, spherical-shaped fruit has been shown to be dominant to elongated fruit. On one

occasion two different spherical varieties were crossed and produced all disk-shaped fruits. When
these hybrid disk-shaped fruits were crossed, they produced 75 disk-shaped fruits, 48 spherical fruits,
and 9 elongated fruits. Explain these results. What will be an ideal response?


9 D__ S__ disk, 3 D__ ss spherical, 3 dd S__ spherical, 1 dd ss elongated; the presence of both
dominant genes produces disk, whereas the presence of either one of the genes as homozygous
recessive produces spherical, and both recessive produces elongated fruit.

Biology & Microbiology

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Attributes of Welwitschia mirabilis include

_____ It has only two leaves. _____ It obtains most of its water from seasonal heavy rains. _____ It lives under desert conditions. _____ It is a gnetophyte. _____ Its stems are photosynthetic, but its leaves are not.

Biology & Microbiology

Rapid turgor pressure changes in specialized multicellular swellings called ____________ are associated with leaves that move in response to touch or light.  

A.  petioles B.  pulvini C.  stipules D.  pudicas E.  coleoptiles

Biology & Microbiology

In what parts of organic compounds is energy stored and available for use?

A.) elemental charges B.) elements C.) chemical bonds D.) molecular weight

Biology & Microbiology

A culture medium consisting of agar, peptone, and beef heart, which are substances in which the amount of ingredients are unspecified, is a

a. chemically defined medium. b. complex medium. c. selective medium. d. differential medium. e. reducing medium.

Biology & Microbiology