Download Non-Mendellian Genetics Part II

Warm-Up (11/19)
On the piece of white paper from the back, answer
the following question.
How might a dihybrid cross between
QqHh and QqHh parents look if the Q
and H genes are very close together
on the same chromosome?
Name
Date
Period
“Gender” is a phenotype
Female ovaries somatic cell
Male testes somatic cell
1m
1p
1m
1p
2p
2m
2p
2m
3p
3m
3p
3m
X
Y
X
X
1p
2p
X
1m
3p
2m
Y
1p
3m
2p
X
1m
3p
2m
X
3m
Critical Thinking Question #1
Discuss this question with your partner and write or
represent it. I will call on three people to share their
partners’ answers.
The Z gene encodes a protein responsible for
recognizing zombie viruses and destroying them.
The Z allele encodes a fully functional protein; the
z allele encodes a non-functional protein. The Z
gene is on the X chromosome. Draw a cross
between a female with the genotype Zz and a male
with one Z allele. Predict the phenotype
distribution of their progeny.
Critical Thinking Question #2
Discuss this question with your partner and write or
represent it. I will call on three people to share their
partners’ answers.
Why does a male with only one X-linked recessive
allele express the recessive phenotype?
Critical Thinking Question #3
Discuss this question with your partner and write or
represent it. I will call on three people to share their
partners’ answers.
Two parents with the genotypes QqHh and QqHh have 1,000 progeny:
332 expressing the phenotypes of the dominant Q and H alleles; 324
expressing phenotypes of the dominant Q and recessive h allele; 346
expressing the phenotypes of the recessive q and dominant H alleles;
and no progeny expressing both recessive phenotypes.
Does this follow the predicted pattern of inheritance?
Many traits do not follow
Mendelian genetics
Mitochondria and
chloroplasts have DNA,
too!
Many traits do not follow
Mendelian genetics
Mitochondria and chloroplasts
have DNA, too!
And sperm do not give
mitochondria to the eggs during
fertilization.
Therefore…
…all mitochondrial genes are
inherited through the mother.
Closure
On the piece of white paper from the
back, answer the following question:
How would a dihybrid cross look
between parents homozygous for the q
gene and heterozygous for the h gene,
(qqHh crossed with qqHh) if the Q gene
was mitochondrial?
Name
Date
Period
Scale
1 – 10