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Intro to Genetics Review

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by

Jemma Sabokrouh

on 12 April 2015

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Transcript of Intro to Genetics Review

Introduction to Genetics
Which scientist used pea plants to study genetics and discovered the principle of dominance?
When an organism has 2
different alleles for the same gene it is...
If an snork is heterozygous
for beak size and small beaks are dominant, will the snork have a big beak or a small beak?
Snorks can have horns that are pointy or rounded. Pointy horns are dominant. Draw a Punnett Square for a cross between a daddy snork who is homozygous dominant for horn shape and a mommy snork who is heterozygous for horn shape.
Based on the previous cross,
how many of the offspring
will have rounded horns?
Gregor Mendel
heterozygous
small beak
None. Zero. Zilch.
Chapter 11 Review
H
H
H
h
HH
HH
Hh
Hh
None. Zero. Zilch.
Write a heterozygous
genotype for gene "Z"
Zz
In snorks, purple eyes is a dominant
trait and yellow eyes is recessive what is the phenotype of a snork who is homozygous recessive for eye color?
Yellow eyes
A trait that is
hidden in the heterozygous condition is...
Recessive
How many alleles
does a person carry for a trait? How many does a gamete carry?
Each person carries 2.
What principle states
that during gamete formation, genes for different traits separate without influencing each other's inheritance?
Principle of independent assortment
Gregor Mendel's
Principles Apply to both plants and animals.
TRUE or FALSE?
true
A blue snork mates with a red snork and the baby snork is purple. This is an example of what pattern of inheritance?
Incomplete dominance
Variation in human skin color is an example of...
polygenic trait
Oak trees get taller as they grow older. Is this an example of environmental factors influencing gene expression?
No.
A snork can have a tail that is straight, curly, or no tail at all. This is an example of...
Multiple alleles
Hydrangea flower color varies
with soil pH. Is this an example of an environmental factor affecting gene expression?
It sure is!
The size of a snork's nose depends on gene Z, but gene X also has an influence on nose size. Nose size in snorks is:
a polygenic trait
Mendel began his experiments by cross pollinating 2 plants with different traits. Then, he let those offspring self-pollinate. What is the name of the generation of the first 2 plants?
A. F1
B. F2
C. F4
D. P
Alleles separate or
"segregate"during the production
of...
P (Parental)
A. cells.
B. gametes
C. mitosis
D. snorks
gametes
A=furry snork
a=bald snork
AA
A
A
a
AA
Aa
A
Aa
What are the genotypes of the offspring? Phenotypes?
Genotypes:AA and Aa
What fraction of these snorks will be small and ugly?
A=adorable
a=ugly
B= big
b= small
1/16
What fraction of these snorks will be big and ugly?
A= Adorable
a=ugly
B= Big
b=small
3/16
gametes each have one
A) Polygenic trait
B) Multiple Alleles
D) Codominance
C) Incomplete Dominance
Phenotypes: All furry
A) Independent Assortment
B Dominance
C) Gravity
D)Meiosis
A) Multiple Alleles
B)Polygenic Traits
C)Incomplete Dominance
D) Codominance
A) Codominant
B)Incompletely dominant
C) Polygenic
D) Multiple Alleles
A chicken homozygous
for white feathers mates
with a rooster homozygous
for black feathers. If
black and white feathers are
codominant, what could their
offspring look like?
Speckled with black and white
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