What period of the Mesozoic era did birds first appear?

2 answers:

6 0

<span>The dinosaurs and the mammals appeared during the Triassic period, roughly 225 million years ago. The dinosaurs went extinct 65 million years ago. The Mesozoic Era lasted about 180 million years, and is divided into three periods, the Triassic, the Jurassic, and the Cretaceous.</span>

Komok [63]3 years ago

4 0

The earliest known birds appeared during the Jurassic Period of the Mesozoic Era, approximately 150 million years ago.

Thats what google said, sooo you decide what you want to do. :) Good luck!

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Why does a pea plant with the genotype Rr produce some gametes that have the allele for round seeds?

Amiraneli [1.4K]

Answer:

The correct answer is - due to the law of segregation.

Explanation:

In the given case the genotype of Rr and as we know R is a dominant characteristic for round seeds and r represents the recessive allele for wrinkled seeds in a pea plant. So if a plant has Rr in its genotype it means it is a phenotypically round pea plant due to dominance in this heterozygous case.

The law of segregation states that two alleles of a gene of a specific trait will be distributed randomly and there is an equal chance of each allele to end up in the gametes, similarly in this case both alleles can be segregated to gametes and it is a random process.

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