In pea plants, purple flowers are dominant over white flowers. which of the following crosses would create an offspring population with all white flowers?
two hybrid plants
two homozygous recessive plants
homozygous dominant plant with a hybrid plant
homozygous recessive plant with a hybrid plant



choose all the answers that apply.

in some plants, pink flowers are dominant over yellow flowers. if marlo crosses two hybrids
the ratio of pink to yellow flowers will be 3: 1
50 percent of the offspring will be hybrids
none of the offspring will have yellow flowers
three-fourths of the offspring will have the same phenotype
half of the offspring will be homozygous for flower color

A) option B, two homozygous recessive plants is correct

B) A, B, D and E  is correct

Explanation:

A) Given purple flowers are dominant over white flowers

Let P represents allele for purple color of flower while p represents white color of flower.

In order to create all white offspring from a cross, the parents must have homozygous recessive genotype i.e pp

Hence, option B, two homozygous recessive plants is correct.

B) Given pink flowers are dominant over yellow flowers. Let “Y” represents allele for pink flower and “y” represent allele for yellow flower

If two hybrid parents with genotype “Yy” are crossed, then following offspring will b eproduced –  

Yy * Yy

YY, Yy, Yy, yy

Out of four , two are hybrid offspring, three genotype i.e YY, Yy, Yy have the same genotype and both YY and yy are homozygous for flower color,  

Hence, option A, B, D and E is correct.

the cells uses some of the atoms of the glucose molecules to atp molecules. the atoms of the glucose molecules will then be converted into energy which will be eventually stored in atp. the energy produced which are stored in atp are coming from the glucose’s chemical bonds.

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.