during prophase i of meiosis, crossing over between the sister chromatids occurs. what is the purpose of this process? to produce genetic variation.
to duplicate the dna.
to remove the nuclear envelope.
to produce the spindle fibers.

In tomato plants, mendel found that the allele for smooth seeds (s) is dominant, while the allele for wrinkled seeds (s) is recessive. which of these punnett squares shows crosses between two plants heterozygous for smooth seeds? i need this to be answered as soon as ! sry the picture is bad quality

Can create a hboth of these instruments can measure wind speed. doppler radar and psychrometer anemometer and hygrometer doppler radar and anemometer radiosonde and psychrometer

The part of the eye that closes and opens to let light in is .