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When you need to determine if an organism is homozygous or heterozygous, you need to cross it with a recessive organism and look at the offspring. Why?
If there are any offspring showing the recessive trait, the dominant individual must be carrying the recessive allele - heterozygous
If an organism is heterozygous, does it show the dominant or recessive trait?
Dominant
If an organism shows the recessive trait, is it heterozygous or homozygous?
Homozygous
In leprechauns, orange hair is dominant to green hair. If you use the letter "H", what genotypes would result in orange hair?
HH. Hh
In penguins, redd are dominant to orange feet. What are the possible off spring phenotypes and probabilities of a homozygous dominant mother and a heterozygous father?
100% red
Long stalks in some plants are dominant to short stalks. Using the letter "L", what are the possible genotypes of a heterozygous mother and a recessive father?
Ll and ll
13) A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. b. What percentage of the offspring will also be homozygous?
0%
13) A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. a. What are the genotypes of the parents?
RR and rr
12) A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR). What percentage of the offspring will be homozygous round?
2/4, 50%
11) A Tt plant is crossed with a Tt plant. What percentage of the offspring will be short
1/4, 25%
10) A TT (tall) plant is crossed with a tt (short plant). What percentage of the offspring will be tall?
4/4 - all - 100%
A gene is...
 
all of the mentioned
 
segment of DNA
 
determines the phenotype
 
a set of intsructions
An organism with 2 identical alleles for a trait is considered
homozygous (purebred)
The different forms of a gene are called...
alleles
If a plant with purple flowers is crossed with a plant that has white flowers and ALL the offspring have purple flowers, which color is dominant?
Purple
On a Punnett Square, each box represents what percentage?
25%
On a Punnett Square, the parents are located on....
the top and side
Recessive alleles are represented by what type of letter?
Lowercase or "little"
Dominant alleles are represented by what type of letter?
Capital or "big" letter
Alleles are represented by....
letters
If the parent is heterozygous, is their phenotype dominant or recessive?
Dominant
Give an example of homozygous dominant genotype using the letter "D"
DD
Give an example of the three (3) options of the genotypes using the letter "T"
TT, Tt, tt
The study of genetics is called...
heredity
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