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olga2289 [7]
3 years ago
9

WILL GIVE LOTS OF POINTS AND BRAINILIST PLEASE HELP

Biology
2 answers:
bekas [8.4K]3 years ago
6 0
Cyanobacteria which is a type of algae. It conducts photosynthesis and without it there may not have been life today because they didn't need oxygen to survive and in order to have oxygen there had to have been some form of life...
cupoosta [38]3 years ago
3 0
Bacteria is the organism that scientists believe was responsible for changing the composition of the early atmosphere. It changed the atmosphere by using energy from the Sun for photosynthesis, and released oxygen as a byproduct. The change on the atmosphere was so important because it added more oxygen to our atmosphere, which brings us to our current atmosphere composition of 21% oxygen and 78% nitrogen.

Hope this helps!
Please give brainliest:)
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Please help! punnet square and shouldn’t be hard! thank you
irina1246 [14]

Answer:

In the resulting offspring the correct proportions are for the genotype 1:1 and for the phenotype 1:1 (first option).

Explanation:

According to Mendel's Laws, the product of the cross between a heterozygous individual and a homozygous recessive for a character will always be a hybrid or recessive offspring as the Punnett square shows on image.

For the character -tall and short- of the pea plant:

Alleles    t         t

T           Tt        Tt

t             tt         tt

<u>For the genotype</u>: probabilities that in the offspring there are hybrid individuals with genotype Tt is 50% and recessive tt 50% .

<u>For the phenotype</u>: the probabilities of tall plants in the offspring are 50%, and 50% short plants.

A 50:50 ratio, for genotype and phenotype, is equivalent to saying that both phenotypic and genotypic ratio is 1:1.

Learn more:

Example of Punnett square brainly.com/question/1299325

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