All categories

3 years ago

HELP ME ASAP!!!!!!!!

Biology

2 answers:

Rufina [12.5K]3 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]3 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

Wild animal attack is which type of disaster

olchik [2.2K]

Wild animal attacks should qualify as biological disasters rather than geological disasters.

Disasters generally refer to accidents that happen rather suddenly and result in widespread damages or loss of lives

Biological disasters are disasters whose causes have biological origins such as plants, animals, humans, and microbes.
Geographical disasters are caused by natural geographical events such as landslides, cyclones, hurricanes, volcanic eruptions, and so on.

Wild animals are biological organisms, hence, an attack from them would be a biological disaster.

More on biological disasters can be found here: brainly.com/question/22882474

7 0

3 years ago

Read 2 more answers

What affects algal growth with increasing depth in the ocean?

andrew-mc [135]

The answer is light.

One of the factors that affect photosynthesis is light. Without light, the photosynthetic rate is reduced or even stopped which consequently affect algal growth. With increasing depth in the ocean, there is less sunlight present. Still, algae have accessory photosynthetic plastids other than the chloroplasts that can absorb different light in greater ocean depths. This helps them to maximum use sunlight in such conditions. But, in the end, at some particular depth, they would not be able to survive.

4 0

3 years ago

This orgennelle is where proteins are made

valkas [14]

Ribosomes are the organelles of the cell which are involved in protein-synthesis (I. e. process of making proteins)

4 0

3 years ago

Which part of a plant protects and ensures the survival of fertilized eggs

never [62]

Internal fertilization protects the fertilized egg or embryo from predation and harsh environments

4 0

3 years ago

Read 2 more answers

Lilit [14]

DNA and RNA both contain a cyclic nitrogenous base, a posphate group and a five-carbon sugar. These are the base units of nucleotides which make up nucleic acids. DNA contains the nitrogenous bases; adenine, thymine, cytosine and guanine wheresas RNA contains the bases; adenine, thymine, cytosine and urasil. DNA codes for the nucleotides in an RNA molecule, whereas DNA codes for the amino acid sequence in a protein

3 0

3 years ago