BIO SCI 97 Lecture 8: Lecture 8 Notes

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pinkhornet528

22 Dec 2018

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Autosomal inheritance - transmission of genes carried on autosomes, chromosomes. There are two copies of each autosome in a diploid organism, one from the. Pedigrees - family trees, are a way of tracing the inheritance of traits in humans mother and one from the father. Standard notation is used to indicate males and females, their relationships, and the individuals who show the trait and those who do not. Each individual who has the trait has at least one parents with the trait. Either gender can transmit the trait to a daughter and/or son. If neither parent has the trait, none of their children will have it. Males and females have the trait in approximately equal frequency. Individuals who have the trait are often born to parents who do not (parents are heterozygous) If both parents have the trait, all children will have it. The trait is not usually seen in each generation, rather it is typically seen among siblings.

Related Questions

According to the multiplication rule of probability, the chance of crossing two pea plants that are heterozygous for height and have none of four offspring showing the recessive short phenotype is:A. Â¼ Ã Â¼ Ã Â¼ Ã Â¼.

B. Â¾ Ã Â¾ Ã Â¾ Ã Â¾.

C. (Â¼ Ã Â¼ Ã Â¼ Ã Â¼) + (Â¾ Ã Â¾ Ã Â¾ Ã Â¾).

D. Â¼ + Â¼ + Â¼ + Â¼.

E. None of the above.

What characteristic is exhibited by an X-linked trait?

a) Only females have the trait.

Females inherit X-linked traits from their maternal parent only.

c) Females can inherit a gene for an X-linked trait from either parent.

d) Males inherit X-linked traits from their paternal parent only.

e) Males can inherit a gene for an X-linked trait from either parent but normally inherit it from their fathers.

What characteristic is exhibited by a Y-linked trait?

		a) Y-linked traits appear only in male offspring of men with the trait.
		b)Y-linked traits are only passed from father to son.
		c) Y-linked traits can be passed from mother to son.
		d) Both A and B are characteristics of Y-linked traits.
		e) Both A and C are characteristics of Y-linked traits.

Which of the following codes for a phenotypic human male?

		a) XO with a copy of SRY gene on an autosomal chromosome?
		b) XXYY with one copy of the SRY gene deleted?
		c) XX with a copy of SRY gene on an autosomal chromosome?
		d) All of the above sex compliments results in a person with a sex phenotype of male.
		e) XY with the SRY gene located on an autosomal chromosome?

In Drosophila, yellow body is due to an X-linked gene (X^y) that is recessive to the gene for gray body (X⁺). A homozygous gray female is crossed with a yellow male. What are the genotypes of the F₁ progeny?

In some goats, the presence of horns is produced by an autosomal gene that is dominant in males and recessive in females. A horned female is crossed with a hornless male. The F₁ offspring are intercrossed to produce the F₂. What proportion of the F₂ females will have horns?

		a)1/2
		b)3/4
		c)1/4
		d) All
		None

a)		Females are X⁺X⁺; males are X⁺Y.
		b)Females are X⁺X⁺; males are X^yX^y.
		c)Females are X⁺X⁺; males are X^yY.
		d) Females are X⁺X^y; males are X^yY.
		e) Females are X⁺X^y; males are X⁺Y.

	Females inherit X-linked traits from their maternal parent only.
		Females can inherit a gene for an X-linked trait from either parent.
		Males inherit X-linked traits from their paternal parent only.
		Males can inherit a gene for an X-linked trait from either parent but normally inherit it from their fathers.

Males can inherit a gene for an X-linked trait from either parent but normally inherit it from their fathers.

lilacmallard101

27. Based on what you learned about various genetic conditions, which of the following individuals is never produced?

	A.	A woman homozygous affected with Duchenne
	B.	A woman homozygous affected with red-green color blindness
	C.	An XYY boy affected with Duchenne
	D.	A woman affected with red-green color blindness who has a normal father and a carrier mother
	E.	A homozygous individual for Dimples

28. Which of the following is NOT correct about sex influenced traits?

	A.	Males and females with the same genotypes may have different phenotypes.
	B.	They can be seen only in one of the sexes, and that is the sex in which, the pattern of inheritance of the trait is dominant.
	C.	A male can inherit the allele of these traits from either of his parents.
	D.	Regardless of the sex of the parent, alleles of these traits can be equally transmitted to sons and daughters
	E.	Their phenotypic expression depends on the sex hormones

Suppose that pattern baldness is caused by a single autosomal gene mutation that has
a dominant effect in males (either one or two copies of the mutation cause pattern
baldness) and a recessive effect in females (two copies of the mutation cause pattern
baldness). A second gene on a different autosomal chromosome affects hair color with
a recessive mutation that results in light hair instead of dark hair. Mary has no pattern
baldness and dark hair. Her mother had pattern baldness and dark hair and her father
had no pattern bladness and light hair. Mary marries John who has no pattern baldness
and light hair.
Question: If a son is born to the couple what is the probability that he has
pattern baldness and dark hair like his maternal grandmother?
Question: If a son is born to the couple what is the probability that he has
no pattern baldness and light hair like his father?
Question 11: If a daughter is born to the couple what is the probability that
she has no pattern baldness and light hair?

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BIO SCI 97 Lecture 8: Lecture 8 Notes

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