Question

Please help me to answer these questions, thank you!

1-When Mendel crossed a plant with smooth green peas and a plant with wrinkled yellow peas, what did he find?

	a-	Color and shape of pea are linked (if you have a smooth pea it has to be green)
	b-	Color and shape of pea are not linked (if you have a smooth pea, it can be green or yellow)
	c-	Only yellow peas produce leaves
	d-	Only smooth peas produce leaves

2-A cross is performed between a plant with genotype TtYy and a plant with genotype Ttyy. T refers to height (tall) and Y refers to color (yellow or white). If the two genes independently assort, what is the probability, expressed as a percent, that the offspring will be homozygous for the height gene?

a-		0%
b-		25%
c-		50%
d-		75%
e-		100%

3- Some plants have flower color that is determined by incomplete dominance, thus both genes are expressed and the color is a blend of the two. In the Four O'clock flower heterozygotes have pink flowers while homozygotes are red or white. A plant with pink flowers was crossed with a plant with red flowers. If 300 offspring were produced, what number of the F1 Generation would have white flowers?

	a-	0
	b-	75
	c-	150
	d-	300

4-The drug Plavix requires the enzyme CYP2C19 to take it from the prodrug form to the drug form (enzyme A below) and it requires the enzyme CES1 to convert it from active to inactive (enzyme 1 below). The active form of the drug is effective in preventing blood clots but is toxic in higher doses. Individuals with a mutation in the CYP2C19 gene produce a version of CYP2C19 that is 50%less effective. You are a physician trying to determine the dosage of Plavix for a patient who is homozygous for the mutated version of the CYP2C19 gene. What should you do?
Prodrug ? Drug ? Inactive Drug
Enzyme A Enzyme 1

a-		Decrease the normal dosage because they are making too much of the toxic endproduct
b-		Increase the normal dosage because they are making too much of the toxic endproduct
c-		Increase the normal dosage because they are not making enough of the drug
d-		Decrease the normal dosage because they are making too much of the drug

5-Which of the following best reflects Mendel's principle of segregation

a-		two chromosomes separate during gamete formation such that every gamete receives both parental forms of the chromosome.
b-		two alleles of a gene separate during gamete formation such that every gamete receives only one allele.
c-		two alleles of a gene duplicate during gamete formation such that every gamete receives both alleles.
d-		all alleles of a gene separate during gamete formation such that each gamete receives two variants of a gene.
	e-	two chromosomes separate during gamete formation such that each gamete receives two copies of each parental gene

6- In pea plants, yellow peas (Y) are dominant to green (y) and round peas (R) are dominant to wrinkled (r). Two pea plants were crossed, one homozygous dominant for yellow round peas and one homozygous recessive for green wrinkled peas. What was the phenotypic ratio of the F2 generation?

		a-9 yellow round: 3 yellow wrinkled: 3 green round 1: green wrinkled
	b-	9 yellow wrinkled: 3 yellow round: 3 green round: 1 green wrinkled
	c-	9 green wrinkled: 3 green round: 3 yellow wrinkled: 1 yellow round
	d-	9 green round: 3 green wrinkled: 3 yellow round: 1 yellow wrinkled

Answer 1

1-When Mendel crossed a plant with smooth green peas and a plant with wrinkled yellow peas, what did he find?

	a-	Color and shape of pea are linked (if you have a smooth pea it has to be green)
	b-	Color and shape of pea are not linked (if you have a smooth pea, it can be green or yellow)
	c-	Only yellow peas produce leaves
	d-	Only smooth peas produce leaves

Answer- Color and shape of pea are not linked (if you have a smooth pea, it can be green or yellow)

Mendel's law of independent assortment states that the allele for two different genes separates independently of each other.

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