studyguide Flashcards
what is a phenotype
-a persons measurable or observable trait** finish
what is a genotype
-a genetic makeup of an individual;
a phenotype is
-a physical trait
which parent contributes the chromosome that determine the gender of the child
-a fathers chromosomes determine the gender of sons and daughters
if two individuals were heterozygous for freckles which is the dom trait what % of their progeny would have freckles
- 75%
an organisms ________determines their _____
-genotype ; phenotype
a mutation in DNA coding region of a protein can cause
- all of the above; different amino acids; no change; change the 3d shape; altered bonding between amino acids
what is the possible outcome of a mutation in terms of protein function
-beneficial; detrimental; neutral; all of the above
a human male has how many pairs of homologous chromosomes
-22
sister chromatids are separated during __
- meiosis 2
what is the principle of independent assortment
- the principle wherein alleles of maternal and paternal genes are aligned in the cell during meiosis and separated independently of one another
which represents a cross between 2 individuals heterozygous for a single trait
-Aa x Aa
which describes a genotype heterozygous for a single trait
-Aa
in a cross between an individual with huntington disease and an unaffected individual what are the chances their progeny will have the disease considering that it is a dominant trait
-50%
a phenotypically normal woman marries a man with wilson disease an autosomal recessive disorder. they have a snow has wilson disease if you need two copies pf the recessive allele to be affected and the mother doesn’t have the disease
-the woman must have been a carrier of one recessive allele and one normal allele
two normal individual have a child who has cystic fibrosis an autosomal recessive disease what wrest he chances of this happening (punnet square)
- 1:4 chance
two people with huntington disease an autosomal dominant disorder have a son what are the chances he will get the disease (punnet)
-3:4 chance
in a cross between two heterozygous parents for two genes what is the chance that any progeny will be homozygous recessive for both traits?
-1:16
a man with AB blood type marries a heterozygous woman with blood type A they have children what percentage of their offspring would have blood type O
-
0%
