The ability to taste the chemical phenylthiocarbamide is an autosomal dominant phenotype, and the inability to taste it is recessive. if a taster woman with a nontaster father marries a taster man who in a previous marriage had a nontaster daughter, what is the probability that their first child will be:
a. a nontaster girl?
b. a taster girl?
c. a taster boy

a. a nontaster girl= 1/8

b. a taster girl= 3/8

c. a taster boy= 3/8

Explanation:

Let's assume that the allele "T" is responsible for the taster phenotype while the recessive allele "t" gives the nontaster phenotype. The taster woman had a nontaster father (tt). Therefore, she is heterozygous dominant (Tt). The taster man had a nontaster daughter (tt) which means that he also has one "t" allele and his genotype is "Tt".

A cross between Tt and Tt would produce progeny in following ratio=

Tt x Tt= 3/4 taster: 1/4 nontaster

The probability of sons and daughters during each reproduction is=

XX x XY= 1/2 XX and 1/2 XY

Therefore,  

a. probability of having a nontaster girl= 1/4 x 1/2  = 1/8

b. a taster girl= 3/4 x 1/2 = 3/8

c. a taster boy= 3/4 x 1/2 = 3/8  

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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