The diagram represents a dihybrid cross between two pea plants heterozygous for both seed color and seed shape.

what is the phenotypic ratio of the offspring?

a) 1: 1: 1: 1: 2: 2: 2: 2: 4
b) 1: 3: 3: 9
c) 1: 4
d) 4: 12

The correct answer would be B) 1:3:3:9.

Dihybrid cross refers to a cross between two organisms that are differ in only two observable characters or traits.

For example, Mendel crossed pure breed pea plants for two contrasting traits- one with round and yellow seeds (RRYY) and other with wrinkled and green seeds (rryy).

Offsprings of first generation were all genetically heterozygous (RrYy) with same phenotype that is, round and yellow seed. Hence, yellow (Y) is dominant over green (y) and round shape of seed (R) is dominant over wrinkled shape (r).

On selfing, second generation resulted in the formation of four types of phenotypes in 1:3:3:9, where:

The figure attached in the question also shows the same results as were observed by Mendel. Hence, the phenotypic ratio of this cross will also be equal to 1:3:3:9 (wrinkled and green : round and green : wrinkled and yellow : round and yellow).

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.