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Genetics (Ch 4)

Name:________________________
Class: ___________ Date: ________
Across
A _____ allele is one whose trait always shows up in the organism when the allele is present.
An organism's _____ is its genetic make up or alleles.
A _____ allele is hidden when a dominant allele is present.
Probability is a number that describes how ____ it is that an event will occur.
Each chromosome is made of two _____.
The body cells of humans contain 46 chromosomes that form 23 _____.
Meiosis produces a total of _____ cells.
Egg and sperm cells join in a process called _____.
A _____ organism has two different alleles for a trait.
The scientific study of heredity is called ______.
Today, scientists use the word _____ to describe the factors that control a trait.
Gregor _____ discoveries from his experiments with pea plants are the foundation of genetics. He is called the father of genetics.
A recessive allele is symbolized by a ____ version of the same letter as the dominant allele.
A ______ square is a chart that shows all the possible ways alleles can combine in a genetic cross.
A dominant allele is symbolized by a _____ letter.
_____ is the process by which the number of chromosomes is reduced by half as reproductive cells form.
The passing of physical characteristics from parents to offspring is _______.
Down
Incomplete dominance occurs when one allele is only ______ dominant.
To draw a Punnett square, you start by drawing a box and dividing it into _______ squares.
Genes pass from parents to offspring on _______.
An organism that has two _____ alleles for a trait is heterozygous.
Some genes have multiple alleles, which means that _______ or more possible alleles determine the trait.
A cross between a red flowing snapdragon and a white flowering snapdragon will produce a plant with ______ flowers.
A specific characteristic is called a ______.
Environmental factors can influence the way genes are ______.
Each one of the four squares in a Punnett square represents ______ percent of the possible offspring.
An organism that has two identical alleles for a trait is said to be ________.
An organisms's ____ is its physical appearance or visible traits.
Each reproductive cell (egg, sperm) has _____ the number of chromosomes of a body cell.
_____ inheritance occurs when more than one gene affects a trait.
A _______ organism is the offspring of many generations that have the same form of a trait.
Co-dominance occurs when both alleles are expressed ________.
______ are the different forms of a gene.