All categories

3 years ago

Assignment: Using Punnett Squares Exploration

2 answers:

7 0

You should draw these simple Punnett Squares as it's easy to see the answers:

1. Crossing RR x Rr results in all (100%) red cow offspring. 50% will be RR (homozygous dominant), 50% will be Rr (heterozygous).

2. Crossing Rr x Rr results in 3 red offspring (75%) and 1 white (25%). Genotypes though will be 25% RR, 50% Rr, and 25% rr.

3. Crossing rr x rr will result in 100% white offspring. All offspring will be rr.

yanalaym [24]3 years ago

4 0

Answer:

a) 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

b) 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

c) 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

Explanation:

a) 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

b) 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

c) 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

You might be interested in

Which type of macromolecules is a steroid

Paha777 [63]

Answer:

Steroids are also lipids but they have a carbon skeleton of four connected rings (no glycerol here) (3.9, pg 41). The different properties of different steroids are due to the attached functional groups. Cholesterol is a steroid that can be modified to form many hormones.

Explanation:

5 0

3 years ago

Which describes the 23 pairs of human chromosomes?

Zigmanuir [339]

Answer:

option B

Explanation:

there are 22 pair of autosome and 2 pair of sex chromosome

3 0

3 years ago

What role do roots play in photosynthesis?

Alexandra [31]

Each plant contains a branched system of tubes called xylem, which is responsible for water transport from the roots (where it is taken up) to the leaves (where it is used in photosynthesis).

hope this answers your question

8 0

3 years ago

Look at the picture below. What does this picture represent?

nata0808 [166]

A. Atoms with an ironic bonds

6 1

3 years ago

Read 2 more answers

If you sort your results by relevance, what will be at the top of the results list?

Lina20 [59]

Actually the information or data in the catalog DB or data base connection takes place by relevance and then mainly here we get the search string or required data which we want or entered, with clear exact search filters which has been directly chosen, and hence these will be at the top of the results list for sure.

3 0

3 years ago