Black fur is dominant to brown fur in rabbits. If a farmer has a black rabbit, w
ID: 14148 • Letter: B
Question
Black fur is dominant to brown fur in rabbits. If a farmer has a black rabbit, what can he do to figure out if it is purebred or hybrid? Design an experiment that would help him figure tins out. x** Achondroplastic dwarfism is a dominant trait in humans. Two dominant alleles is a lethal genotype What is the probability of two dwarf people having a normal child? ** A normal woman and a dwarf m an plan to have children What is the probability of them having normal children?** Huntington's disease is caused by a dominant allele. Homozygous dominant is a lethal combination. People who inherit one dominant allele from a parent will develop the disease in middle age. It is fatal and there is no cure. Unfortunately, people usually have kids before they show symptoms. What are the chances that a person with Huntington's will pass the gene on to his or her kids? ( assume the partner is normal ) **Explanation / Answer
Answer by conducting Test cross
B------BLACK ,b-brown
BB BLACK x bb brown
B
B
b
bB BLACK
bB BLACK
b
bB BLACK
bB BLACK
IF IT IS PURE HOMOZYGOUS PURE BRED ALL OSSFPRING ARE BLACK
Bb BLACK x bb brown
B
b
b
bB BLACK
bb brown
b
bB BLACK
bb brown
IF IT IS heterozygous black ----------
- 50% are OfFPRING ARE BLACK
- 50% are OfFPRING ARE brown
===================
Normal dd x Heterozygous Dd
D
d
d
Dd
Heterozygous ACHONDROPLASIA
dd
NORMAL
d
Dd
Heterozygous ACHONDROPLASIA
dd
NORMAL
Normal ----------child =50%
===================
Heterozygous Dd x Heterozygous Dd
D
d
D
DD LETHAL ELIMINATED
Dd
Heterozygous ACHONDROPLASIA
d
Dd
Heterozygous ACHONDROPLASIA
Dd NORMAL
Normal ----------child = 25%
Heterozygous Hh x Heterozygous Hh
H
h
H
HHLETHAL ELIMINATED
Hh
Heterozygous
h
Hh
Heterozygous
Hh
NORMAL
Answer ----50 %-of child will carry the genes
B
B
b
bB BLACK
bB BLACK
b
bB BLACK
bB BLACK
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