Awoman gives birth to a son who has type o blood. she has type b blood. which of the following can be concluded from this about her parents' blood types? a.) one of her parents had at least one o allele. b.) one of her parents had two b alleles. c.) one of her parents had type b blood and the other type o blood. d.) one of her parents had type o blood.

The correct answer would be option A.

Explanation:

The allele for the O group is recessive to the allele of B blood group, so the genotype of the mother should be heterozygous with one allele of O and one allele of B blood group because the son has O blood group.

This condition is only possible if one parent of the mother had at least one allele of the O blood group to carry its next generation.

Thus, the correct answer would be option A.

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

hope it !

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".