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777dan777
1 day ago
15

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have v

ery different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. a. Forelimb evolution was adaptive in people and bats, but not in whales. b. Natural selection in an aquatic environment resulted in significant changes to whale forelimb anatomy. c. Genes mutate faster in whales than in humans or bats. d. Whales are not properly classified as mammals
Biology
1 answer:
11111nata11111 [1.8K]1 day ago
8 0
Option B. Explanation: The skeletal structures of the forelimbs in humans and bats are quite similar, while whales exhibit distinctly different forelimb structures due to their adaptations through natural selection in aquatic environments. This evolutionary change resulted in whales having flippers that facilitate swimming. Although the forelimbs of humans, bats, and whales evolved from a common ancestor, they diverged in structure because of differing environmental pressures.
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Explanation:

To determine the answer, one should utilize a Punnett Square. This tool illustrates the genetic combinations produced from the mating of two parent organisms, allowing visualization of how their alleles combine in offspring. The Punnett Square consists of a grid with eight boxes; one parent's alleles are arranged along the top row, and the other's are positioned down the first column. Each allele from one parent matches with the alleles from the other, filling in the remaining boxes. This results in a genetic probability for the potential offspring's traits.

For the question posed, the cross involving parents who both have Tt (Tt x Tt) alleles is represented below, using the Punnett Square.

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T        TT       Tt

t        Tt        tt

Within these results, we see that "tt" appears just once among the four possible offspring. Thus, we have a ratio of 1/4, which converts to 0.25, indicating a 25% likelihood that the offspring from this cross will exhibit the "tt" genotype.

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They are entirely identical in every aspect, sharing the same genes and allele configurations.

Still, minor variations can occur between the identical sister chromatids due tomutations fromerrors during replication, and differences can also arise in the lengths of telomere repeats.

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