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4 years ago

In humans, curly hair is dominant over straight hair. Which cross below has the correct probabilities listed

Biology

2 answers:

KiRa [710]4 years ago

7 0

Curly hair=C
straight hair=s
CC,Cs
Cs,ss

adell [148]4 years ago

5 0

Answer:

A.a woman heterozygous for hair curl, a man heterozygous for hair curl will produce 25% straight hair, 75% curly hair

Explanation:

a woman heterozygous for hair curl, a man heterozygous for hair curl will produce 25% straight hair, 75% curly hair

using C as the allele for hair curl:

Cc x Cc will produce the following genotypes: CC, Cc, Cc, cc

25% will be homozygous dominant (curly hair)

50% will be heterozygous (curly hair)

25% will be homozygous recessive (straight hair)

combine the curly hair genotypes since the question asked about phenotypes which results in 75% curly and 25% straight.

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In horses, black color(B) dominates chestnut color(b). The trotting gait(T) dominates the pacing gait (t). A cross is made betwe

bulgar [2K]

Answer:

<h2>a. BbTt;</h2><h2>b. BbTt X BbTt ;</h2><h2> Parent 1: BT bt Bt bT </h2><h2> Parent 2: BT bt Bt bT ;</h2><h2>c. BBTT , BbTt , BBTt , BbTT , BbTt , BbTt , BBTt , BbTT , BBTt , Bbtt , BBtt , BbTt , BbTT , bbTt , BbTt , bbTT.</h2><h2> d. 12:1:1:2</h2>

Explanation:

As given Block color is dominant over chesnut color, so B is dominant over b.

Chestnut color=bb ;

Trotting gait is dominant over pacing gait, so T is dominant over t .

Pacing gait=tt

Now; cross between

(a) homozygous black, pacing gait is= BBtt; and horse homozygous for chestnut color, trotting gait is= bbTT

BBtt x bbTT

gametes are ; Bt and bT,

Progeny are BbTt, BbTt,

All progeny will be BbTt heterozygous Black color and heterozygous trotting gait

b. a cross is made between two horses, both of who are heterozygous black trotter = BbTt X BbTt

Possible gametes of each parent are;

Parent 1: BT bt Bt bT

Parent 2: BT bt Bt bT

c. Punnett square and all the possible gene combinations that results are;

Cross between these gametes

BT bt Bt bT

possible gene combinations ; BBTT , BbTt , BBTt , BbTT , BbTt , BbTt , BBTt , BbTT , BBTt , Bbtt , BBtt , BbTt , BbTT , bbTt , BbTt , bbTT.

d. expected phenotype ration of the offspring.

Black color and trotting gait horse 12: chestnut and trotting gait horse 1: Black color pacing gait horse 1: chestnut and trotting gait horse 2.

so 12:1:1:2

6 0

4 years ago

describe the benefits and drawbacks of experiments in a laboratory compared with experiments in a natural setting

madam [21]

Answer:

Experimental set up in the lab.are under the control of the scientist,therefore they can manoeuvre the the surrounding conditions to suit the experimental set up for best results. In addition the lab.environment does not involve the complex interactions or reaction between the set up and the lab. environments, compare to the natural environment.

Natural experimental set up gives accurate results from the interaction of the organisms(e.g animals) under investigation in the natural environments,thus the results obtained are natural interaction of the organisms based on the environmental factors the organism are exposed to.However, the number of organisms are usually large,and therefore great effort is needed to determine the actual cause and effects of the factors affecting the organisms under investigations in this natural environments.

7 0

4 years ago

I need help with dis one too plz!!!question 5

Kruka [31]

Explanation:

4) option D

5) option A

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8 0

3 years ago

Cancer can be described as a disease characterized by the cell cycle going out of control. Discuss what it means for the cell cy

djyliett [7]

Cancer happens when there is an alteration in the normal division and growth of the cells in the body which would commonly result in lumps or masses called tumors. In cancer, cells continue to form abnormal cells and invade other tissues of the body. T<span>elomeric</span><span /><span> stop signals are reduced and cells which normally shouldn't be dividing at a rate multiply exponentially. </span>

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3 years ago

Which organ systems do you believe are most important for the human body? Include at least 2 reasons why.

Vinil7 [7]

Answer:

The brain and the nervous system that attaches to the brain make up the most 2 critical organs in the human body.

5 0

3 years ago

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