Answer:
the first wave of extinction may be related to rapid cooling at the end of the Ordovician Period, and the second phase is widely regarded as having been caused by the sea-level fall associated with the glaciation.
Spawning.......................................................
The answer is rr because if it were "Rr" it would be round. Dominant always exceeds the recessive. so if both traits were recessive, it would be recessive. so "rr" is your answer
Answer:
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Genotype is the set of genes( allele) of an organism.
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Phenotype is the physical expression of the genetic composition of an organism.
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Explanation:
Genotype: 1. It is the genetic composition of an organism, means it is the set of genes( allels) of an organism's DNA, which is responsible for a particular trait of an organism.
2. Genotypically, an organism can be homozygous(dominant or recessive) or heterozygous. Some Alleles are dominant over other, means some can be dominant or other can be recessive.
3. Genes are responsible for all the traits in an organism, and these traits are inheritable. All the offsprings inherit all traits from their parents.
Phenotype: 1. Physical expression of the genetic composition of an organism resulted as phenotype.
2. It is the physical expression of genes (alleles) which are responsible for any trait.
