01:447:380 Lecture 13: Sex Determination and Sex Linked Traits and Disorders

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purpleant173

3 Aug 2018

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Sex determination and sex linked traits and disorder. Monoecious = one house, aka hermaphroditic one organism possesses both sex"s org. Dioecious = two houses, each organism possesses one sex"s organs. Autosomes = numbered chromosomes; sex chromosomes = x and y in many organisms, z. Heterogametic = produce two different types of gametes (i. e. x-bearing vs y-bearing sper. Homogametic = all gametes have the same chromosome content (females) Most dioecious organisms use a chromosomal mechanism for sex. Females have two xs, males have one x there is no o chromosome. Males are heterogametic x-bearing sperm versus sperm with no sex chromosome the punnett square); both has set of autosomes. Bees do not have sex chromosomes--female bees are diploid; males are haploid. The queen stores the male"s sperm in a separate compartment, and fertilizes only s and other factors influence the percent of eggs fertilized.

Related Questions

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!!!

01:447:380 Lecture 13: Sex Determination and Sex Linked Traits and Disorders

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