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Human males have a dark spot on the edge of the nucleus (bar body) identifying the inactive x chromosome

False

Humans have 22 paits of autosomes and 2 pair of sex chromosomes

False

A carrier of a recessive genetic disorder usually does not express any symptomes of the disease

True

Linked genes are genes for different traits located on the same chromosome

True

The father actually dertermines the gender of the child

True

Mitosis followed by cytokinesis is teresponsible for all of the following except

Production of egg and sperm

Which phrase is marked by the arrival of chromosomes at the poles?

telophase

If you view a cell in which gentic material is beginning to be visible as seperate bodies, and the nuclear envelope has disappeard from view, you may surmise that the cell is in

prophase

The process that actually divides that parent cell into two daughter cells is called

cytokinesis

Spindle fibers

are used to ogranize and move chromosomes during mitosis

At the end of meiosis 1, the resulting two cells are

haploid and genetically different

What seperates in anaphase 1 of meiosis

homologus chromosomes

DNA replication occurs

between the gap phases of interphase

A diploid cell has

has two of each type of chromosome

Chromosomes that come from different parents yet are the same size and have the same genetice composition are

homologus chromosomes

The segeregation principle explains how each gamete

has only one copy of each gene

Which of the following does NOT produce genetic variation

Asexual reproduction

Which of the following molecules controls progress of the cell cycle?

growth factor controls

Crossing over

increases variablity in gametes

All but one of the following are characteristc of cancer cells choos the EXCEPTION

Essentially normal funcioning cells.. they just have lost control of cell division

The spread of cancer from one site to the others in the body is known as

metastasis

Sexual reprodution

results in new combinations of genetic traits

A leading cause of human reproductive failure and miscarriages is due to the fetus having an ancorrect number chromosomes whish is the cause

nondisjunction of chromosomes in meiosis 1 or 2

Different forms of a gene are known as

alleles

Homozygous dominant (AA) homozygous recessive (aa) and heterozygous (Aa) are terms used to describe and individuals

geneotype

Carriers are

heterozygous

Type AB blood is an example of ___ which means that the heterozygous display two phenotypes at the same time

codominace

Usually, an egg cell from a human female contains

one X chromosome

In a Punnett square, the letters with the little boxes represent

offspring genotypes

Recessive phenotypes

are only seen in homozygous recessive individuals

Duchenne muscular dystrophy is inherited from an X-linked recessive allele. What is the probability that a son with Duchenne MD inherited this disease from his biological father

0

An allele is ____ if its effects masks that of a ___ allele paired with it.

dominant, recessive

If short hair (L) is dominat to long hair (l), animals LL and Ll Have the same

phenotypes

If a pure-breeding long tail cat is crossed with a pure breeding cat with no tail, cand a cat with a chort tail, is produced the simplist explinaition is

an incompletely dominat gene

If one parent has type a blood and the other parent has type b then which of the following is possible in the children

A, B, AB, and O

Traits such as human eye color and height demonstrate continuous variations bc

they are influenced by several genes

Which of the following would be the LEAST satisfactroy orgainsm for genetic research?

Humans

Most genetic disorders in humans are the result of

X-linked inheritance

Which of the following can be determined by and individuals karyotype?

The number and structual composition of an individuals chromosomes

Occurs in somtic cells...

mitosis

gives rise to gametes...

meiosis

generally produces 4 daughter cells...

meiosis

required chromosome replicaiton must be complete before hand...

mitosis and meiosis

produces gentically identical daughter cells...

mitosis

increase genetic diversity in offspring...

meiosis

LL...

homozygous

Ll...

heterozygous

Long-Stemed plant...

phenotype

L and l...

alleles

Determines plant height...

gene

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