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What is the name for a cross between an individual of unknown genotype and a homozygous recessive?
A cross between a homozygous recessive and an individual of unknown genotype is called a test cross.The homozygous recessive can only pass on a recessive allele to the offspring, and so any recessive in the other parent will show up in the phenotype (detectable characteristics) of some of the offspring.
A test cross made with a cat that may be heterozygous for a recessive trait what is the presumed genotype of the cat explain?
A test cross made for a heterozygous recessive trait would show a dominant gene and a recessive gene. The cat would have one dominant gene (A) and 1 recessive (a).
What part affected by the cross eye?
the part affected cross eye is eyes
What is the probability of a homozygous recessive offspring?
It depends. If it's a heterozygous cross, (Tt x Tt), there's a 25% chance. If it's a homozygous dominant cross (TT x TT), the chance is 0%. Neither parent has the alleles for a recessive trait, so none of their offspring can have the recessive trait. If it's a homozygous recessive cross (tt x tt), there's a 100% chance. The only alleles the parents can pass on are recessive.
Who is least likely to be affected by cross winds?
a car is least likely to be affected by cross winds
If a test cross between a homozygous recessive and heterozygous allele will yield what percent of offspring as homozygous recessive?
25%
How can you identify an autosomal recessive pedigree?
Perform a test cross of two homozygous individuals base on a hypothesis, I usually just guess to begin with. Hypothesis: Example: Purple x White all Purple Then cross the F1 generation (those guys above) Purple x Purple you get the fallowing ratios if the purple allel is dominant 3/4 Purple 1/4 white Usually you are given a number of offspring for problems like this so lets Example: purple x white F1 all purple would mean purple is dominant, you can take it further too. F2 100 offspring= 25 white and 75 purple Note: In real life numbers wont be nice and even like this so you may have to do some chi squared analysis to check your hypotheses.
Which genotype is used in a test cross?
A homozygous recessive as male parent
If you are conducting a monohybrid cross of tall dominant and dwarf recessive plants the recessive trait in the F1 plants?
Appears in a ratio of 2:1.
What is a testcross?
Gregor Mendel devised the fundamental tool of the test cross. It is an experimental cross of an individual organism of dominant phenotype but unknown genotype and an organism with a homozygous recessive genotype .
What is the name of the cross that involves the mating of an unknown dominant phenotype plant with a homozygous recessive plant for the same trait?
Test Cross
What fraction of the cross in figure 10-7 will be recessive for both traits?
1/16
