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3 years ago

Which organelle forms the surface of a cell separating its content from the outside world?

Biology

2 answers:

statuscvo [17]3 years ago

7 0

<h2>Answer:</h2>

Cell membrane is the organelle forms the surface of a cell separating its content from the outside world.

<h3>Explanation:</h3>

It is outer most layer of cell which is a barrier for molecules and ions freely floating outside to enter the cell.

It is usually made up of lipid bilayer with some proteins embedded in it.
The lipid layer made it hydrophobic which repels water content from both sides.
Water content (cytoplasm ) of cell remains in cell due to cell membrane.

Sati [7]3 years ago

6 0

cell membrane forms the surface of a cell to protect it from the outside world.

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Assuming diallelic genes, that express complete dominance, and assort independently, 1) Genotypic ratio=1:2:1. Phenotypic ratio=3:1 / 2) Parental genotype: PpRr. Gametes= PR, Pr, pR, pr. Phenotypic ratio: 9:3:3:1

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We will assume diallelic genes that express complete dominance. In cases where two or more genes are involved, we will assume they are not linked, and alleles assort independently.

1) FRECKLES

F is the dominant allele that codes for freckles

f is the recessive allele that codes for no-freckles

Cross: Between a mother and a father who both have freckles and are heter0zyg0us for the trait

Parentals) Ff x Ff

Gametes) F f F f

Punnett square) F f

F FF Ff

f Ff ff

F1) Genotype

1/4 = 25% of the progeny is expected to be h0m0zyg0us dominant, FF

2/4 = 1/2 = 50% of the progeny is expected to be heter0zyg0us, Ff

1/4 = 25% of the progeny is expected to be h0m0zyg0us recessive, ff

Phenotype

3/4 = 75% of the progeny is expected to express freckles, FF + Ff

1/4 = 25% of the progeny is expected to not express freckles, ff

Genotypic ratio ⇒ 1:2:1

Phenotypic ratio ⇒ 3:1

2) FLOWER COLOR AND SEED SHAPE

P is the dominant allele that codes for purple flowers

p is the recessive allele that codes for white flowers

R is the dominant allele that codes for round seeds

r is the recessive allele that codes for wrinkled seeds

Cross: Between two plants that are heter0zyg0us for flower color and seed shape

Parentals) PpRr x PpRr

Gametes) PR, Pr, pR, pr PR, Pr, pR, pr

Punnett square) PR Pr pR pr

PR PPRR PPRr PpRR PpRr

Pr PPRr PPrr PpRr Pprr

pR PpRR PpRr ppRR ppRr

pr PpRr Pprr ppRr pprr

F1) Genotype

1/16 individuals are expected to be PPRR

2/16 individuals are expected to be PPRr

1/16 individuals are expected to be PPrr

2/16 individuals are expected to be PpRR

4/16 individuals are expected to be PpRr

2/16 individuals are expected to be Pprr

1/16 individuals are expected to be ppRR

2/16 individuals are expected to be ppRr

1/16 individuals are expected to be pprr

Phenotype

9/16 individuals are expected to have purple flowers with round seeds, PPRR + PpRR + PPRr + PpRr

3/16 individuals are expected to have purple flowers and wrinckled seeds, PPrr + Pprr

3/16 individuals are expected to have white flowers and round seeds, ppRR + ppRr

1/16 individuals are expeceted to have white flowers and wrinckled seeds, pprr.

Phenotypic ratio ⇒ 9:3:3:1

Genotype of parent plant 1: PpRr

Gamete 1: PR
Gamete 2: Pr
Gamete 3: pR
Gamete 4: pr

Genotype of parent plant 2: PpRr

Gamete 1: PR
Gamete 2: Pr
Gamete 3: pR
Gamete 4: pr

 PHENOTYPE GENOTYPE 

purple flowers, round seeds: PPRR, PpRR, PPRr, PpRr

purple flowers, wrinkled seeds: PPrr, Pprr

white flowers, round seeds: ppRR, ppRr

white flowers, wrinkled seeds: pprr

 PHENOTYPE NUMBER 

purple flowers, round seeds: 9

purple flowers, wrinkled seeds: 3

white flowers, round seeds: 3

white flowers, wrinkled seeds: 1

------------------------------------

You can learn more about monohybrid and dihybrid crosses at

brainly.com/question/1185199?referrer=searchResults

brainly.com/question/24076691?referrer=searchResults

brainly.com/question/2669862?referrer=searchResults

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3 years ago