All categories

3 years ago

What is a selectively permeable membrane?

Biology

2 answers:

Marianna [84]3 years ago

6 0

the ablity of the cell membrane to allow something to pass through while preventing other things from passing through

hope it helped:)

Doss [256]3 years ago

5 0

A selective permeable membrane is a membrane but it only allows some things to go through and not others.

You might be interested in

When roan cattle are crossed, 25% of the offspring produced will have white coats, 50% will have roan coats, and 25% will have r

larisa [96]

Answer:

The results indicate that parentals were heterozygous for coat color and that the trait is inherited by incomplete dominance.

Explanation:

Note: Due to technical problems, you will find the explanation in the attached files.

Download pdf

5 0

3 years ago

The nucleus, which directs cellular activities, is separated from the cytoplasm by

Paha777 [63]

The Nucleus is separated from the cell’s cytoplasm by a membrane. The nucleus contains hereditary materials made of plenty proteins and DNA. The nucleus directs all cell activities. Nucleus is commonly found in Eukaryotic cells. The genetic materials found in the Nucleus is organized as DNA molecules, together with a wide array of proteins, which causes to form chromosomes.

6 0

3 years ago

In garden peas, the yellow seed trait is dominant over green seeds. Also, the round seed trait is dominant over the wrinkled-see

Darina [25.2K]

Answer:

405 individuals will be yellow and round seeded.

Explanation:

Available data:

the yellow seed trait is dominant over green seeds
round seed trait is dominant over the wrinkled-seed trait
These genes are on separate chromosomes

Let´s name the seed color genes Y, and the seed shape gene R

Y is the dominant allele for seed color expressing yellow

y is the recessive allele for seed color expressing green

R is the dominant allele for seed shape expressing round

r is the recessive allele for seed shape expressing wrinkled

Cross: between two plants that are heterozygous for both traits

Parental) Yy Rr x Yy Rr

Gametes) YR yR Yr yr YR yR Yr yr

Punnet Square) YR yR Yr yr

YR YYRR YyRR YYRr YyRr

yR YyRR yyRR YyRr yyRr

Yr YYRr YyRr YYrr Yyrr

yr YyRr yyRr Yyrr yyrr

F1) 720 individuals

9/16 yellow and round seeded individuals, Y-R-

3/16 green and round seeded individuals, yyR-

3/16 yellow and wrinkle seeded individuals, Y-rr

1/16 green and wrinkle seeded individuals, yyrr

Note: the "-" symbol in the phenotypes means that there it could be either a dominant or recessive allele.

If 720 is the total number of individuals in the F1, then:

16 possible genotypes ---------- 100% of the progeny -------- 720 individuals

9 yellow and rounded----------- 56.25% ----------------------------405 individuals

3 green and rounded-------------18.75%------------------------------135 individuals

3 yellow and wrinkled-------------18.75%------------------------------135 individuals

1 green and wrinkled--------------6.25%-------------------------------45 individuals

7 0

3 years ago

14. What happens during the development stages that happen between a

strojnjashka [21]

Answer:

First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst. Inside the uterus, the blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes.

7 0

2 years ago

The fluid - mosaic model of the cell membrane suggests that the membrane is primarły composed of proteins and lipids . Which of

never [62]

Answer:

Proteins can carry nutrients across the plasma membrane. There are also differnet receptros outside the cell that recieve signals as well as inside the cell.

Explanation:

5 0

3 years ago