A level Biology: Post your doubts here!

[fleurisabelle]

"The allele for grey fur in a species of animal is dominant to white, and the allele for long tail is dominant to short.
Using the symbols, G and g for coat color, and T and t for tail length, draw a genetic diagram to show the genotypes and phenotypes of the offspring you would expect from a cross between a pure-breeding grey animal with a long tail and a pure-breeding white animal with a short tail."

How do all the offsprings have genotype GgTt. Could somebody draw the genetic diagram for me to have an idea of it?

 

[My Name]

"The allele for grey fur in a species of animal is dominant to white, and the allele for long tail is dominant to short.
Using the symbols, G and g for coat color, and T and t for tail length, draw a genetic diagram to show the genotypes and phenotypes of the offspring you would expect from a cross between a pure-breeding grey animal with a long tail and a pure-breeding white animal with a short tail."

How do all the offsprings have genotype GgTt. Could somebody draw the genetic diagram for me to have an idea of it?

Is this question from the past papers?

 

[fleurisabelle]

Is this question from the past papers?

no...the book of Mary Jones Biology

 

[fleurisabelle]

Is this question from the past papers?

you are a biology student too, couldn't you make the genetic diagrm for me please?

 

[My Name]

you are a biology student too, couldn't you make the genetic diagrm for me please?

There you go!

 

[fleurisabelle]

View attachment 58731
There you go!

thank you so much!

 

[My Name]

thank you so much!

Welcome

 

[nehaoscar]

View attachment 58731
There you go!

Wouldn't dominant (G) be white and dominant (T) be short since the question says:
The allele for grey fur in a species of animal is dominant to white, and the allele for long tail is dominant to short ??

 

[My Name]

Wouldn't dominant (G) be white and dominant (T) be short since the question says:
The allele for grey fur in a species of animal is dominant to white, and the allele for long tail is dominant to short ??

No,I think it's the other way round.I'm abit confused now.
Midnight dream what do you say how should it be?

 

[nehaoscar]

No,I think it's the other way round.I'm abit confused now.
Midnight dream what do you say how should it be?

Yeah even I'm confused
I don't get it why it says
The allele for grey fur in a species of animal is dominant to white
Does that mean the dominant allele codes for grey or white fur?

 

[nehaoscar]

Or does it mean that the allele for grey fur is dominant as opposed to white :S

 

[My Name]

Yeah even I'm confused
I don't get it why it says
The allele for grey fur in a species of animal is dominant to white
Does that mean the dominant allele codes for grey or white fur?

Or does it mean that the allele for grey fur is dominant as opposed to white :S

I think grey is dominant.

 

[Lola_sweet]

can someone please explain this point in the syllabus which is under Chapter 14: Homeostasis
i) outline the role of cyclic AMP as a second messenger with reference to the stimulation of liver cells by adrenaline and glucagon.

I understand glucagon and cyclic AMP but not adrenaline :/

 

[misscute406]

a_wiserME!! NotYourType check page 1!!

 

[Eugene99]

How to find the percentage concentration of salt? and what exactly do they mean by percentage concentration of salt? (summer 2009, practical paper 32)

 

[nehaoscar]

For complete A2 Biology chapter summaries check this out:
https://www.xtremepapers.com/community/threads/a2-biology-summaries.42826/
For more revision notes check out my signature below

 

[HumptyR]

Normal venous pressure in the feet is 3.3 kPa. When a person stands very still venous blood
pressure in the feet rises to 5.0 kPa. What causes the high pressure?
A Muscles in the walls of the veins contract, reducing the diameter of the veins.
B Skeletal muscles in the legs are not squeezing blood upward in the veins.
C Systolic blood pressure increases.
D The semilunar valves in the veins of the leg cease to function.

 

[HumptyR]

Suggest one role for the pre-capillary sphincter muscle.

 

[My Name]

Suggest one role for the pre-capillary sphincter muscle.
View attachment 59082

They can control the blood flowing through the capillaries by constriction.

 

[My Name]

Normal venous pressure in the feet is 3.3 kPa. When a person stands very still venous blood
pressure in the feet rises to 5.0 kPa. What causes the high pressure?
A Muscles in the walls of the veins contract, reducing the diameter of the veins.
B Skeletal muscles in the legs are not squeezing blood upward in the veins.
C Systolic blood pressure increases.
D The semilunar valves in the veins of the leg cease to function.

It will be B.
What is your doubt?