A set of regulator genes is known to be very similar in both humans and flies. This fact is used to indicate what about the two species?
What will be an ideal response?
It is evidence of common ancestry.
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DNA associates very tightly with nucleosomes because
A. DNA can form covalent bonds with histone proteins. B. negative charges on DNA are attracted to positive charges of the histone proteins. C. the histone tails wrap tightly around the DNA double helix. D. the amino acids of histone proteins are largely acidic, while DNA molecules are basic. E. histone H1 tightens the coils of DNA that are wrapped around the nucleosome.
What are two typical ratios that result from crossing heterozygotes with homozygous organisms?
What will be an ideal response?
The trait of medium-sized leaves in iris is determined by the genetic condition PP?. Plants with large leaves are PP, whereas plants with small leaves are P?P?. A cross is made between two plants each with medium-sized leaves. If they produce 80
seedlings, what would be the expected phenotypes, and in what numbers would they be expected? A) 20 (large leaves), 20 (medium leaves), 40 (small leaves) B) 40 (large leaves), 40 (medium leaves), 0 (small leaves) C) 40 (large leaves), 0 (medium leaves), 40 (small leaves) D) 10 (large leaves), 60 (medium leaves), 10 (small leaves) E) 20 (large leaves), 40 (medium leaves), 20 (small leaves)
What is the hallmark of all horizontal gene transfers?
1) Transfer of DNA between organisms of the same generation 2) Transfer of DNA using a virus 3) The use of plasmids 4) Transfer of DNA from parent to offspring