DESTROYERMODE2308

29.03.2020 • 

Biology

The length of a dog’s tail is an inherited trait. The allele for short tails is dominant (T) over the allele for long tails (t).
A dog breeder mates two short-tailed dogs (parents). One parent is homozygous and the other is heterozygous for this trait.
A litter of twelve puppies (first generation), all with short tails, is produced. The breeder mates one of the twelve puppies (first generation) with a short-tailed dog from another litter. A litter of ten puppies is produced (second generation). The breeder is surprised when one of the second-generation puppies has a long tail. (4.8, 4.9)Immersive Reader
(10 Points)
a. What are the genotypes of the original two dogs (parents)?

b. Complete a Punnett square of the parent cross to show the possible genotypes of the first generation of puppies. Identify the genotypic and phenotypic ratios.

c. Complete a Punnett square of the cross between the first-generation dog and the short-tailed dog from another litter to show the possible genotypes of the second generation of puppies. Identify the genotypic and phenotypic ratios.

d. Explain how a long-tailed dog can suddenly appear when all the other dogs were short-tailed.

Ответ:

321596

13.01.2020

Biology

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The three variables that should be kept constant in the setup of the student's investigation:

temperature of the reactionpH of the reactionamount of enzyme

CONSTANT VARIABLE:

In an experiment, a constant variable is that variable that must be kept constant or unchanged in order not to affect the outcome of the experiment. Constant variable is also called control variable. In this experiment, a student is investigating how substrate concentration affects the rate of an enzyme catalyzed reaction.The constant variable i.e. the variable that the student should keep constant are as follows:temperature of the reactionpH of the reactionamount of enzymeKeeping these variables above constant means not allowing temperature, pH or amount of the enzyme interfere with the experimental outcome.

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