Question

1. what is a limitation of phylogenetic analyses? a. clear ancestral reconstructions b. complete data availability c. no impact from missing data d. missing genetic sequences leading to inaccuracies 39. how are okazaki fragments formed during dna replication? a. by the action of ligase sealing gaps b. by continuous synthesis of the leading strand c. by unwinding the dna double helix d. by synthesizing short segments on the lagging strand 40. if two heterozygous individuals for a particular trait (aa x aa) have offspring, what is the genotypic ratio of the offspring? a. 1:1 b. 2:1:1 c. 3:1 d. 1:2:1

Explanation:

• For question 38, phylogenetic analyses rely on genetic data. Missing genetic sequences can lead to inaccurate inferences about evolutionary relationships, making it a limitation. Clear ancestral reconstructions and complete data availability are not limitations. No impact from missing data is incorrect as missing data does matter.
• For question 39, Okazaki fragments are synthesized as short segments on the lagging strand during DNA - replication. Ligase seals the gaps after Okazaki fragments are formed, continuous synthesis is of the leading strand not related to Okazaki - fragment formation directly, and unwinding the DNA double - helix is a prior step for replication but not the formation mechanism of Okazaki fragments.
• For question 40, when two heterozygous individuals (Aa x Aa) have offspring, using a Punnett - square analysis, the genotypes of the offspring are AA:Aa:aa in a 1:2:1 ratio.

Answer:

1. d. Missing genetic sequences leading to inaccuracies
2. d. By synthesizing short segments on the lagging strand
3. d. 1:2:1