BIO 320 Lecture Notes - Lecture 1: Cutis Laxa, Genotype Frequency, Sister Chromatids

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15 Apr 2016

School

Stony Brook University

Department

Biology

Course

BIO 320

Professor

hollignsworthandkernan

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Document Summary

Clicker questions: purple flower color (p) is dominant to white flower color (p). When the f1 plants were crossed to each other, a ratio of 3 round: 1 wrinkled progeny was observed. Of the resulting progeny pea plants, 47 exhibited round peas and 52 exhibited wrinkled peas. A purple spiny plant is crossed to a purple smooth plant and the following offspring were obtained: A dotted lentil plant was crossed to a spotted and dotted lentil plant and the following offspring were observed: Dotted: : spotted and dotted: spotted. What were the genotypes of the parents in this cross: cdc x cdcs, cdcd x cdcs, cdcs x cdcs, cdc x csc, cdcd x cscs. 2016: polydactyly (extra fingers or toes) in humans results from a rare dominant mutation. Studies have shown that the mutant is 40% penetrant. A woman with polydactyly marries a normal man.

Related Questions

A homozygous white-flowered plant is crossed with a homozygous dark purple-flowered plant. All of the seeds grow into pale purple-flowered plants. A) If there is no dosage effect, is it more appropriate to write the genotype for the white-flowered plant âWWâ or âppâ? B) What is your reasoning? (3 pts)

Uppercase letters are used to represent dominant genes and lowercase letters are used to represent recessive genes. All of the seeds grew into pale purple-flowered plants, the dominant gene would be purple and the recessive gene would be white. You would write the genotype for the white-flowered plant as âppâ instead of âWWâ because the white would be the recessive gene. How would I explain that they are both homozygous? Is this explanation correct?

Purple flower = PP

White flower = pp

	P	P
p	Pp	Pp
p	Pp	Pp

. Pea plantshave a single gene, 2 allele trait for flower color where F (purpleflowers) is dominant to f (white flowers) and a single gene, 2allele trait for seed shape where R (round) is dominant to r(wrinkled).?

H) INDICATE THE POSSIBLE GENOTYPES OFPARENT PEA PLANTS IN CROSSES YIELDING THE FOLLOWINGRATIOS:

1) 3 ROUND: 1 WRINKLED SEED

2) ALL WHITE FLOWERS

3) ALL PURPLE FLOWERS (3 POSSIBILITIES)

4 ) 1 ROUND: 1 WRINKLED SEED

sangriaotter215

1. A mother with blood type A has a child with blood type A. Give all possible blood types for the father of this child.

a.) O

b.) B, AB

c.) A, AB

d.) A, B, O

e.) A, B, AB, O

2.) In sesame, the one-pod condition (P) is dominant to three-pod (p), and normal leaf (W) is dominant to wrinkled (w). These characteristics assort independently. A one-pod, wrinkled leaf Ã one-pod, normal leaf cross gave a progeny of 654 one-pod, normal leaf plants and 224 three-pod, normal leaf plants. What are the likely genotypes of the parents in this cross?

		a.) Pp ww Ã Pp Ww
b.)		Pp Ww Ã Pp Ww
c.)		Pp ww Ã Pp WW
d.)		PP Ww Ã Pp ww
	e.)	PP ww Ã PpWw

3.) Honeybees have a haplo-diploid sex determination system where females develop from a fertilized egg (they are diploid, having one allele from the female queen and one allele from the male), and males develop from unfertilized eggs (they are haploid, having only one allele from the queen). Assuming that the queen is heterozygous for a particular gene, what is the probability that a female will inherit the recessive allele from her mother? What is the probability that a male will inherit a recessive allele from his mother?

		a.) The probability that a daughter will inherit a recessive allele from her mother is 50%; the probability that a son will inherit a recessive allele from his mother is 100%.
		b.) The probability that a daughter will inherit a recessive allele from her mother is 100%; the probability that a son will inherit a recessive allele from his mother is 50%.
		c.) The probability that a daughter will inherit a recessive allele from her mother is 50%; the probability that a son will inherit a recessive allele from his mother is 50%.
		d.) The probability that a daughter will inherit a recessive allele from her mother is 100%; the probability that a son will inherit a recessive allele from his mother is 100%.

4.) Human males, with XY chromosomes are _____ and produce two different kinds of gametes, whereas females with XX chromosomes are _____ and produce only one kind.

a.)		homogametic; heterogametic
		b.) pleiotropic: epistatic
		c.) heterogametic; homogametic
		d.) epistatic; pleiotropic

5.) A chi-square test is done to test the hypothesis that a set of data represents a F₂ ratio of 9:3:3:1. The degree(s) of freedom that should be used is:

		a.) 1
		b.) 2
		c.) 3
		d.) 4 I DON'T KNOW HOW TO DO THESE PROBLEMS, I WOULD REALLY APPRECIATE SOME HELP AND EXPLANATION ON HOW TO WORK OUT THESE PROBLEMS. THANK YOU VERY MUCH!!!

BIO 320 Lecture Notes - Lecture 1: Cutis Laxa, Genotype Frequency, Sister Chromatids

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