BIO152H5 Lecture : bio152 lec 7.docx

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coralhare22

1 May 2012

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How are traits passed from parents to offspring. H1 : blending inheritance: small + large = medium rabbit. Heredity: transmission of traits from parents to offspring. Mendel was first person to study heredity in scientific way. Sellf-fertilization: pollen from stamen fertilizes egg in carpel of same flower (self pollination, male organs produce pollen grains, which produce male gametes. female organ receives pollen. Cross pollination: feritlization of one plant by pollen from another plant. Genetic model: hypotheses trying to explain how a particular trait is inherited. Pure lines: individuals that produce offspring like themselves when self- pollinated or crossed to another individual of a pure line pop. Hybrid: created bby mating two different pure lines that differed i one or more traits. Pea plant was good sample b/c inexpensive, lots of offspring, To produce f2, mendel let the plants in the f1. To produce an f1 generation, mendel pushed aside common plant, different traits.

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

How was it established that particular phenotypes are inherited as a result of genetic information present in the chloroplast rather than in the nucleus?

The organelle heredity is detected when the paternal parent has more influence than the maternal parent over the phenotype of the offspring. In addition, assuming other factors such as X-linked inheritance can be eliminated, different results from reciprocal crosses support inheritance by extranuclear elements.

The organelle heredity is detected when the maternal parent has more influence than the paternal parent over the phenotype of the offspring. In addition, assuming other factors such as X-linked inheritance can be eliminated, different results from backcrosses support inheritance by extranuclear elements.

The organelle heredity is detected when the paternal parent has more influence than the maternal parent over the phenotype of the offspring. In addition, assuming other factors such as X-linked inheritance can be eliminated, different results from backcrosses support inheritance by extranuclear elements.

The organelle heredity is detected when the maternal parent has more influence than the paternal parent over the phenotype of the offspring. In addition, assuming other factors such as X-linked inheritance can be eliminated, different results from reciprocal crosses support inheritance by extranuclear elements.