BIO152H5 Lecture Notes - Lecture 7: Zygosity, Fundamental Theorem Of Arithmetic, Wild Type

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taupegoldfish605

8 Dec 2016

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Chromosome theory of inheritance: mendelian genes have specific loci along chromosomes that undergo segregation and independent assortment. Fruit fly (drosophila melongaster: p: all flies have red eyes. Conclusion: red eye color is dominant to white: f1: female flies have red eyes, male flies have white eyes. Sex-linked inheritance: a trait determined by genes on the sex chromosome is said to be sex linked. In ovaries, barr body chromosomes are re-activated in the cells that give rise to eggs, resulting in every female gamete having an active x. Mutant alleles are recessive to wild-type and are not sex-linked: most offspring had a parental phenotype suggesting the body color and wing size are linked on the same chromosome and are thus inherited together. Abnormal chromosome number (nondisjunction: aneuploidy: an abnormal number of chromosomes, monosomic: a missing chromosome, trisomic: an extra chromosome, polyploidy: more than 2n chromosomes in all somatic cells.

Related Questions

In fruit flies, the gene for eye color is sex-linked (X-chromosome)and red eye color is dominant over white. The gene for body coloris an autosomal trait with gray dominant over black. A heterozygousred-eyed, pure-bred gray female mates with a heterozygous gray malewho has red eyes. What is the probability that any of the offspringproduced have he following traits? You must show your work (i.e.Punnett squares) to get credit.

a. Red eyes
b. gray body
c. white eyed female
d. white eyes and heterozygous gray body
e. female and red eyed gray body

peachzebra571

1. What is the chromosome theory of inheritance?

2. Understand how independent assortment can cause gametes to have four combinations of alleles when an individual is heterozygous for two genes on two different chromosomes.

3. What are linked characters and linked genes? Understand why linked genes will not independently assort.

4. How can crossing over affect linked genes?

5. What are recombinant gametes?

6. Define recombinant frequency. Be able to use the recombinant frequency to determine how close two genes are on a chromosome.

7. What is a linkage map?

8. What is the function of the SRY gene on the Y chromosome? What happens if you don't have this gene?

9. Know how sex is determined in mammals, birds, bees and ants, and reptiles.

10. How many autosomes and sex chromosomes do normal human haploid and diploid cells have?

11. What does it mean for a gene to be X-linked or Y-linked?

12. Be able to answer word problems and fill out a Punnet square involving an X-linked recessive trait.

13. Which sex is more likely to have an X-linked recessive disorder? Understand why.

P.s The most simple answer would be preferable. I would be copping the notes over that you will provide to my noteb book and add my details to it.

greylocust179

The following question is a sex-linked trait. Review the patterns of inheritance of sex-linked traits before answering the following questions. Make sure to indicate chromosomes and alleles in your answers when necessary.

Hemophilia is a caused by a recessive mutation found on the X chromosome in humans. The recessive allele (X^h) is associated with abnormal blood clotting (hemophilia), while the dominant allele (X^N) causes normal blood clotting.

A man with normal blood clotting and woman who is heterozygous are going to have a child. What is the probability of an offspring who is a carrier of hemophilia, and if so, the sex(es) of the offspring?

A. Chances are 25% of a son who is a carrier

B. There is no chance of an offspring who is a carrier

C. Chances are 50% of either a son or a daughter who is a carrier

D. All offspring, male or female, will be carriers

E. Chances are 1 in 4 of a daughter who is a carrier

2. Two fruit flies, one with red eyes and one with white eyes mate and have an offspring with white eyes. Having red eyes is a dominant trait (R) while white eyes (w) is recessive. Based on this information, what must be the genotypes of the parental white-eyed fruit fly and the parental red-eyed fruit fly?

A. Red-Eyed fruit fly: Rw

White-eyed fruit fly: ww

B. Red-Eyed fruit fly: RR

White-eyed fruit fly: wR

C. Red-Eyed fruit fly: R

White-eyed fruit fly: w

D. Red-Eyed fruit fly: rr

White-eyed fruit fly: wr

E. Red-Eyed fruit fly: RR

White-eyed fruit fly: ww

BIO152H5 Lecture Notes - Lecture 7: Zygosity, Fundamental Theorem Of Arithmetic, Wild Type

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