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HBio

HBio genetics

QuestionAnswer
In Mendel’s experiment, what was the F2 generation phenotype ratio? 3 purple:1 white
What law shows that two different characteristics separate out randomly when making gametes law of independent assortment
In humans the first 22 pairs are called what? autosomes
Cross a homozygous dominant with a homozygous recessive. What are the genotypes? 4 Gg
Term for study of heredity? genetics
Term for a photo of chromosomes in a dividing cell, arranged by size, that can determine chromosomal abnormalities? karyotype
In Mendel’s experiment, what was the P generation using flower color? truebreeds of purple and white
Term for when you have two identical alleles for a gene? give an example in letter form. homozygous – TT or tt
Cross a heterozygous with a heterozygous. What are the genotypes? (use G/g) GG:2Gg:gg
Term for a trait that hides another trait? give an example in letter form. dominant - T
Term for passing of traits from parents to offspring? heredity
Term for segment of DNA that codes for a particular protein? gene
Term for a set of alleles? genotype
In Mendel’s experiment, what was the F1 generation phenotype? all purple
If a human has an XX for their sex chromosomes, are they male or female? female
A somatic cell is haploid or diploid? diploid
Term for when you have two different alleles for a gene? give an example in letter form. heterozygous Tt
Term for different versions of a gene (like purple and white flower color) allele
If a human has an XY for their sex chromosomes, are they male or female? male
Name 3 reasons why Mendel used pea plants for genetic study? -traits are observable -can self fertilize -small, grows quickly
Term for the physical appearance? phenotype
Term for a trait that is hidden? give an example in letter form. recessive – t
In a pedigree how would we show a male that has the trait we are observing? Filled-in square
What is a single term to explain incomplete dominance? Blending
What is an example of a multiple allele trait? ABO blood typing
In pedigrees, traits can be sex-linked or ___________. Autosomal
For females to express a recessive sex-linked trait, how many alleles for that trait do they have to receive in order to display that trait? 2 copies
When dealing with a trait that is codominant, explain what a heterozygous individual will display. They will have ½ of one version and ½ the other version.
What is a genotype for heterozygous Type B blood? Bi
Can a female ever get a sex-linked recessive disorder? If no, explain why. If yes, give example of genotype. yes, XhXh
Autosomal means the chromosome pairs numbered 1-? 1-22
What little letters do we never use with blood typing? a, b
What is the term for when there are several genes that will influence a trait (example: skin color in humans) Polygenic trait
Why can’t males be a carrier for a recessive X-linked disorder? Because males only get one X chromosome, so they have it or do not.
Sex-link traits are mostly on which of the sex chromosomes? X chromosome
In a dihybrid cross: B=black/b=brown, T=trotter/t=pacer If parent 1 is hetero black and a pacer: If parent 2 is brown and a hetero trotter: Determine the parent genotypes. Then determine the gametes for both? Then determine the phenotypes? parent 1:Bbtt parent 2:bbTt gamete: Bt, Bt, bt, bt gamete: bT, bt, bT, bt phenotypes: 4 for each type
Give phenotypes with percentage of a cross from an AB blood type against a heterozygous type A. 50% A, 25% AB, 25% B
Give phenotypes with percentages for an incomplete dominant snapdragon. The possible phenotypes are red, pink, white. Cross a pink with a white. 50% pink, 50% white
Hemophilia is a recessive xlinked condition. Cross a female carrier and a male not affected. Give the gender and percent for offspring that would have the condition. 25% male
Created by: thompsondk
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