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memorize.ai (lvl 286)

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What controls variations in skin color among humans?

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Date created

Mar 1, 2020

Cards (24)

Section 1

(24 cards)

What controls variations in skin color among humans?

Front

multiple alleles of a single gene

Back

What genetic disorder results in abnormally shaped blood cells?

Front

sickle-cell disease

Back

Which of these traits is controlled by a gene with multiple alleles?

Front

blood type

Back

Sex-linked genes are genes on

Front

the X chromosome only

Back

Which combination of sex chromosomes results in male human beings?

Front

XY

Back

Why are sex-linked traits more common in males than in females?

Front

A recessive allele on the X chromosome will always produce the trait in a male

Back

Which form of selective breeding crosses parents with the same or similar sets of alleles?

Front

inbreeding

Back

A carrier is a person who has

Front

one recessive and one dominant allele for a triat.

Back

What is the purpose of the Human Genome Project?

Front

to identify the DNA sequence of every gene in the human genome

Back

Down syndrome most often occurs when

Front

chromosomes fail to separate properly during meiosis.

Back

What are multiple alleles?

Front

three or more forms of a gene that code for a single trait

Back

Which of these human traits is altered by variations in environment?

Front

height

Back

Cloning results in two organisms that are

Front

genetically identical

Back

Which form of selective breeding crosses genetically different individuals in an attempt to keep the best traits of both parents?

Front

hybridization

Back

Genetic disorders are caused by

Front

mutations

Back

What is pedigree?

Front

a chart that tracks which members of a family have a particular trait

Back

How can genetic counselors predict genetic disorders?

Front

by studying karyotypes and pedigree charts

Back

What must occur for a girl to be colorblind?

Front

Each parent must have the recessive allele for colorblindness.

Back

What is a karyotype?

Front

a picture of the chromosomes in a cell

Back

One parent of a child has type A blood and the other has type B blood. What is the child's blood type.

Front

It could be all of these

Back

What is a genome?

Front

all the DNA in one cell of an organism

Back

How does a geneticist use pedigrees?

Front

to trace the inheritance of traits over generations of families

Back

Which genetic disorder causes the body to produce unusually thick mucus in the lungs and intestines?

Front

cystic fibrosis

Back

No two people have the same DNA, except for

Front

identical twins

Back