BIOL 1020 Lecture 21: Lecture 21

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erinchimpanzee657

12 May 2017

School

University of Manitoba

Department

Biological Sciences

Course

BIOL 1020

Professor

Joy Stacey

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BIOL 1020 Full Course Notes

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Human somatic cells (any cell other than a gamete) have 23 pairs of chromosomes (46) A karyotype is an ordered display of the pairs of chromosomes from a cell (sex determined) The two chromosomes in each pair are called homologous chromosomes, or homologues. Chromosomes in a homologous pair are the same length and carry genes controlling the same inherited characteristics. (different because one from each parent) 22 pairs and a pair of sex chromosomes in human karyotype. The sex chromosomes are called x and y. Human females have a homologous pair of x chromosomes (xx) Human males have one x and one y chromosome (not homologous-x and y carry different genes- single copy of each gene on each chromosome) The 22 pairs of chromosomes that do not determine sex are called autosomes. Each pair of homologous chromosomes includes one chromosome from each parent.

Related Questions

Which processes contribute directly to genetic variaion?

? What is meant by ploidy? Diploid? Haploid?

? Know the phases of meiosis?

? Know the differences between meiosis and mitosis.

? What is the major difference between metaphase of mitosis and metaphase I of meiosis?

? What is the major difference between meiosis II & mitosis?

? What is crossing over? ? What is synapsis?

? What are chiasmata?

? What are autosomes?

? What are sex chromosomes? What are the sex chromosomes in human male? Human female?

? What are homologous chromosomes?

? What is genetic recombination?

? What is fertilization? What are gametes?

? What are histones? What is chromatin?

? How many autosomes do humans have? Have many pairs of autosomes? How many pairs of sex chromosomes? What is the total number of chromosomes that human have? ? What are the sites of crossing over called?

? What is a karyotype?

? What is Down syndrome?

? What is polyploidy?

? What is nondisjunction?

? What is trisomy and monosomy

pucecat917

1. only one chromosome of a homologous pair is present in a cell

2. sister chromatids seperate

3. homologous chromosomes pair up

4. parent cell and daughter cells are genetically identical to each other

5. chromosomes replicate before nuclear division

6. crossing over

7. involved in growth and repair

8. homologous chromosomes separate

9. synthesis of sister chromatids before division

10. independent assortment

Answer Choices:

A. occurs ONLY in meiosis

B. occurs in BOTH mitosis and meiosis

C. occurs ONLY in mitosis

harlequineel895

The size of one copy of the human genome is approx 3 billion base pairs, and it contains about 25,000 genes organized into 23 chromosomes. A. Human chromosomes vary in size. What would you predict is the size of the average chromosome? B. Assuming that genes are spread evenly among chromosomes, how many genes does an average human chromosome contain? C. About half of the DNA in chromosomes contains genes. ow large (in base pairs) is an average human gene? I know the human genome is 23 chromosomes, 3 X ^9 base pairs which is = to mb and 20,000-30,000 genes. Maybe the way the question is asked is throwing me off?? Please help and Thank you.

beigegnat658

BIOL 1020 Lecture 21: Lecture 21

BIOL 1020 Full Course Notes

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