(i need some help here pls)
2 answers:
Answer:
Your answer would be:
C.) Catastrophism
Scientists look at a modern-day geologic event; whether as sudden as an earthquake or as slow as the erosion of a river valley; to get a window into past events. This is known as uniformitarianism. The idea is that Earth has always changed in uniform ways and that the present is the key to the past.
Catastrophism means the theory that changes in the earth's crust during geological history have resulted chiefly from sudden violent and unusual events.
Explanation:
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Answer:
The offsprings of this punnet square will be Dd, Dd, dd and dd in a ratio 1Dd : 1dd
See attached image for punnet square completion
Explanation:
This question involves a cross involving a single gene with alleles D and d where allele D is dominant over allele d i.e. D will mask the phenotypic expression of d in a heterozygous state.
This cross is between a heterozygous parent (Dd) and a homozygous recessive parent (dd). Parent Dd will produce gametes D and d while parent dd will produce gametes d and d.
Using these gametes in a punnet square, four possible offsprings with two distinct genotypes will be produced. The genotypes are: Dd and dd in a ratio 1:1
Hence, the possibility of having a heterozygous dominant offspring is 1/2 while the possibility of having a homozygous recessive offspring is also 1/2.
