All categories

4 years ago

HELP ME ASAP!!!!!!!!

Biology

2 answers:

Rufina [12.5K]4 years ago

7 0

Answer:

R R

R RR RR

r Rr Rr

Genotypic ratio: RR : Rr = 2 : 2 = 1: 1

Phenotypic ratio: homozygous red bull (RR) : heterozygous red cow (Rr) = 2:2 = 1: 1

R r

R RR Rr

r Rr rr

Genotypic ratio: RR : Rr:rr = 1:2:1

Phenotypic ratio: homozygous red bull (RR) : heterozygous red cow (Rr) : homozygous white bull (rr) = 1: 2: 1

Xr Yr

Xr Xr Xr Xr Yr

Genotypic ratio: Xr Xr: Xr Yr = 2: 2 = 1: 1

Phenotypic ratio: homozygous white cow (Xr Yr) : heterozygous white bull (Xr Yr) = 2: 2 = 1: 1

Explanation:

First cross is between a a homozygous red bull (RR) and a heterozygous red cow (Rr)

This shows that "Red" color is a dominant trait

So the cross between Rr and RR is

R R

R RR RR

r Rr Rr

Genotypic ratio: RR : Rr = 2 : 2 = 1: 1

Phenotypic ratio: homozygous red bull (RR) : heterozygous red cow (Rr) = 2:2 = 1: 1

Cross between a heterozygous red bull (Rr) and a heterozygous red cow (Rr)

R r

R RR Rr

r Rr rr

Genotypic ratio: RR : Rr:rr = 1:2:1

Phenotypic ratio: homozygous red bull (RR) : heterozygous red cow (Rr) : homozygous white bull (rr) = 1: 2: 1

Cross between a homozygous white bull (rr) and a homozygous white cow (rr)

Xr Yr

Xr Xr Xr Xr Yr

Genotypic ratio: Xr Xr: Xr Yr = 2: 2 = 1: 1

Phenotypic ratio: homozygous white cow (Xr Yr) : heterozygous white bull (Xr Yr) = 2: 2 = 1: 1

enyata [817]4 years ago

6 0

A)

Therefore:Crossing results in 50% (dominant homozygote) and 50% (dominant heterozygote).
b)

Therefore:Crossing results in 25% (dominant homozygote), 50% (dominant heterozygote) and 25% (homozygous recessive).
c)

Therefore:Crossing results in 100% (homozygous recessive).

You might be interested in

A group of gases that trap heat and warm the earth are known as ____

DerKrebs [107]

Answer: greenhouse gases

Explanation:

7 0

3 years ago

how can scientists test their ideas about the orgin of the unverse if they cant physically interact with or study it

Galina-37 [17]

The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

3 0

3 years ago

Water supply shortages will affect many people by the middle of this century. The process of desalination, removing the ________

Furkat [3]

c removing salt and minerals

the process of desalination removes salt and minerals so water is safe to drink

A Biomass

This is because it is easily replenished naturally and over a short period of time but only if there is a large quantity of biomass available. If there is little biomass than it will be nonrenewable.

7 0

4 years ago

Read 2 more answers

When making bread, yeast, flour, sugar, and water are mixed together and set in a warm area to rise. A student cut the rising do

Elan Coil [88]

Answer:

Carbon Dioxide

Explanation:

I just know

7 0

4 years ago

What kinds of diseases can vaccinations prevent?

amm1812

Any infectious diseases can be prevented by vaccinations

<u>Explanation:</u>

Vaccines defend against infectious diseases that cause severe illness and seldom death.
It prevents disease in somebody who receives them and protects those who get into contact with unvaccinated individuals.
Vaccines include the corresponding antigens or parts of it that cause illnesses, but the antigens in vaccines are either destroyed or incapacitated.
When they are introduced into fatty tissue or muscle, vaccine antigens are not powerful enough to generate the symptoms and signs of the disease but are tough enough for the immune system to build antibodies against them.

3 0

3 years ago